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Amazon Music Azure Private Link - Simply Explained
Azure Private Link is Microsoft's networking service for securely accessing Azure services over a private connection instead of the public internet. By using private endpoints, organizations can connect services such as Azure Storage, SQL Database, Key Vault, and many others directly to their virtual network, keeping all traffic on Microsoft's private backbone network and significantly improving security.
In this episode of Microsoft Knowledge Nuggets, Mirko Peters explains Azure Private Link in simple terms and shows why it has become a key building block for secure cloud architectures. You'll learn how Private Link works, what private endpoints are, and why many organizations use it to eliminate public exposure for critical Azure services.
The episode covers key concepts including Private Endpoints, Private Link Services, private IP addresses, DNS integration, virtual networks, and secure access to Azure PaaS services. It also explains how Azure Private Link integrates with services such as Azure Storage, Azure SQL Database, Key Vault, App Service, Azure AI services, and on-premises environments connected through VPN or ExpressRoute. You'll discover how Private Link helps reduce the risk of data exfiltration while simplifying secure connectivity across hybrid and multi-region deployments.
You'll also learn the differences between Azure Private Link and Service Endpoints, helping you understand when each networking option is the right choice. Understanding these concepts is essential for designing secure, enterprise-ready Azure environments.
Whether you're an Azure administrator, network engineer, cloud architect, or IT professional, this episode provides a practical introduction to Azure Private Link. By the end, you'll understand how Private Link secures Azure services, simplifies private connectivity, and helps organizations build modern cloud environments without exposing critical resources to the public internet.
Quick answer: Azure Private Link is covered in this M365 FM episode with a practical focus on what it is, how it works, and the decisions that matter for architecture, adoption, security, governance, or day-to-day operations.
Azure Private Link serves as a vital service that provides secure and private connectivity to Azure services. By using private IP addresses, Azure Private Link minimizes exposure to potential threats. This approach ensures that all traffic remains within the Microsoft network, eliminating the risks associated with public endpoints. In case of a security incident, Azure Private Link restricts data extraction from other resources sharing the same endpoint. With this innovative solution, you can enhance your security posture while simplifying your network architecture.
Key Takeaways
- Azure Private Link provides secure, private connectivity to Azure services, minimizing exposure to threats.
- Using private IP addresses, Azure Private Link keeps all traffic within the Microsoft network, enhancing security.
- Private endpoint connections isolate traffic from the public internet, reducing the risk of unauthorized access.
- Implementing Azure Private Link simplifies network architecture by eliminating the need for public IPs.
- Azure Private Link helps organizations comply with regulations like GDPR and HIPAA by keeping data traffic private.
- The service operates at a competitive pricing model, offering cost savings compared to traditional solutions.
- Integrating Azure Private Link with Azure services enhances security and simplifies management of cloud resources.
- Utilizing Azure Private Link allows businesses to focus on core operations while ensuring data protection.
Azure Private Link Overview
Azure Private Link is a powerful service that enhances your secure connectivity to Azure services. It allows you to connect privately to various Azure resources without exposing them to the public internet. This service is essential for organizations that prioritize data security and compliance.
Key Features
Azure Private Link offers several key features that make it a valuable addition to your cloud strategy. Here’s a summary of its main features:
| Feature | Description |
|---|---|
| Enhanced Security | Traffic remains isolated from the public internet, reducing the risk of data interception. |
| Simplified Network Architecture | Eliminates the need for public IPs, simplifying network management. |
| Improved Performance | Ensures low latency and consistent throughput by keeping traffic within Azure's private network. |
| Better Compliance | Helps meet data residency regulations by keeping traffic within Azure regions. |
| Scalability and Flexibility | Supports private access to various Azure services and third-party services, ideal for hybrid cloud environments. |
| Seamless Integration | Allows secure access to a wide range of Azure services without exposing them to the internet. |
These features collectively enhance your security posture and simplify your network architecture.
Private Endpoint Connections
Private endpoint connections are a crucial aspect of Azure Private Link. They allow you to isolate traffic from the public internet effectively. Here’s how they function:
- Private Link allows for the isolation of traffic by blocking data access from unauthorized networks or the public internet.
- It reduces the risk of data exfiltration by ensuring that only approved private endpoints can access the resources.
- The use of virtual network (VNet) injection keeps all traffic within customer-defined network boundaries.
By utilizing private endpoint connections, you can ensure that your Azure resources remain secure and accessible only to authorized users. This approach not only enhances security but also simplifies the management of your network.
Benefits of Azure Private Link
Azure Private Link offers numerous advantages that can significantly enhance your cloud strategy. By leveraging this service, you can improve security, simplify your network architecture, and achieve cost efficiency.
Enhanced Security
With Azure Private Link, you gain enhanced security for your data. This service ensures that your data traffic remains private, which is essential for compliance with regulations like GDPR and HIPAA. Here are some key points regarding security benefits:
- Azure Private Link keeps your data traffic isolated from the public internet.
- It reduces the risk of data interception and exfiltration by allowing only approved private endpoints to access your resources.
- The architecture supports regulatory requirements by providing network isolation and full auditability.
By implementing Azure Private Link, you can confidently manage sensitive workloads while adhering to strict compliance standards.
Simplified Network Architecture
Azure Private Link simplifies your network architecture by providing private connectivity to Azure services. This approach eliminates the need for public internet exposure, which is crucial for enterprises that must adhere to strict security and compliance standards. Here’s how it simplifies your setup:
- You no longer need to configure complex network address translation (NAT) or VPN gateways. All traffic can route through a private endpoint without public IP addresses.
- This reduction in complexity leads to a smaller attack surface for sensitive workloads.
- You can maintain a clear and manageable network structure, making it easier to oversee and secure your resources.
By utilizing Azure Private Link, you streamline your network management while enhancing security.
Cost Efficiency
Implementing Azure Private Link can lead to significant cost savings for your organization. Here’s how:
- Azure Private Link operates at a competitive pricing model, costing only $0.01 per hour. In contrast, traditional solutions like Azure ExpressRoute can cost around $55 per month.
- By reducing the need for additional security measures, such as VPN gateways, you can lower your overall operational costs.
- The simplified architecture also means less time spent on network management, allowing your team to focus on more strategic initiatives.
How Azure Private Link Works
Azure Private Link operates through a well-defined technical architecture that ensures secure and private connectivity to Azure services. Understanding this architecture helps you appreciate how Azure Private Link enhances your network security.
Technical Architecture
The technical architecture of Azure Private Link consists of several core components that work together to provide seamless connectivity. Here are the main elements:
- Entry Point: The
private-link-demo.bicepfile orchestrates the deployment of all other modules. - Core Infrastructure: This includes essential modules such as network, storage, key vault, compute, and monitoring.
- Private Link Components: Key components include DNS zones, private link service, and private endpoints.
- Diagnostics: This feature configures diagnostic settings for all resources, ensuring you can monitor and troubleshoot effectively.
By utilizing these components, Azure Private Link establishes a robust framework for secure access to Azure services.
Azure Private Endpoint Functionality
The private endpoint is a critical feature of Azure Private Link. It allows you to connect securely to Azure services without exposing them to the public internet. Here’s how it works:
- Azure Private Endpoint enables traffic to flow entirely within the Microsoft backbone network. This minimizes exposure to security threats.
- It provides a private IP address for Azure services, preventing public internet access. This ensures that your data remains secure.
- The platform validates network connections, ensuring only authorized access to the private-link resource.
When you establish a private endpoint connection, you create a direct link between your Azure Virtual Network and the Azure service. This connection keeps your data traffic isolated from the public internet, enhancing security and compliance with various regulations.
To set up a private endpoint, you need to follow a few prerequisites:
- Ensure you have an Azure subscription.
- Establish an active ExpressRoute circuit or site-to-site VPN connection between your on-premises network and an Azure virtual network.
- Your Azure virtual network should be in the same region as your Azure Arc-enabled servers.
By meeting these requirements, you can leverage Azure Private Link to facilitate private access to Azure services. This setup not only protects sensitive data but also helps you comply with security and regulatory requirements.
Pricing for Azure Private Link
Understanding the pricing model for Azure Private Link is essential for making informed decisions about your cloud strategy. Azure Private Link offers a straightforward pricing structure that allows you to manage costs effectively while benefiting from secure connectivity.
Pricing Model
Here’s a breakdown of the pricing details for Azure Private Link:
| Service Type | Pricing Details |
|---|---|
| Private Link Service | No charge |
| Private Endpoint | $- per hour |
| Inbound Data Processed | 0-1 PB - $- per GB, 1-5 PB - $- per GB, 5+ PB - $- per GB |
| Outbound Data Processed | 0-1 PB - $- per GB, 1-5 PB - $- per GB, 5+ PB - $- per GB |
This pricing model allows you to leverage private connectivity without incurring additional charges for the Private Link Service itself. However, you will need to consider the costs associated with private endpoints and data transfer.
Cost-Benefit Analysis
When evaluating the costs of Azure Private Link, consider several factors that contribute to your overall expenses:
- Data transfer costs can vary based on service-specific egress fees, region, and traffic direction.
- Private Link does not make all network transfers free; charges may still apply.
- Infrastructure costs are higher due to the need for additional networking components and private endpoint mappings.
- Operational complexity increases as maintaining private endpoint integrations and secure routing requires more engineering effort.
- Security and compliance benefits justify higher costs, as Private Link offers stronger protection and helps meet compliance frameworks.
- Dedicated performance on Microsoft's backbone network ensures reliability but incurs additional resource costs.
By weighing these factors, you can determine whether the benefits of enhanced security and compliance outweigh the costs associated with Azure Private Link. This service provides a robust solution for organizations that prioritize secure access to Azure services while managing their cloud resources effectively.
Comparing Azure Private Link with Other Services
When considering secure connectivity options in Azure, you may find yourself weighing Azure Private Link against Azure VPN and Azure ExpressRoute. Each service has its strengths, and understanding these can help you choose the right solution for your needs.
Azure VPN vs. Azure Private Link
Azure VPN provides a secure connection between your on-premises network and Azure. It uses the public internet to establish this connection. In contrast, Azure Private Link offers private access to Azure services through private endpoints. Here are some key differences:
- Traffic Exposure: Azure VPN traffic travels over the public internet, while Azure Private Link keeps traffic within the Microsoft network.
- Security: Azure Private Link enhances security by limiting access to specific resources, reducing the risk of data leakage.
- Performance: Azure Private Link often provides more consistent performance due to its reliance on Microsoft's internal network.
Azure ExpressRoute vs. Azure Private Link
Azure ExpressRoute establishes a dedicated, private connection to Azure. This connection uses MPLS or Ethernet, offering high bandwidth and low latency. Azure Private Link, on the other hand, provides private access to Azure PaaS services via private endpoints. Here’s a comparison of their features:
| Feature | Azure ExpressRoute | Azure Private Link |
|---|---|---|
| Connectivity | Dedicated, private connection using MPLS or Ethernet | Private access to Azure PaaS services via private endpoints |
| Performance | High bandwidth and low latency due to dedicated connections | Consistent performance using Microsoft’s internal network |
| Use Case | Ideal for connecting on-premises infrastructure to Azure | Best for securing access to Azure services without public internet exposure |
Both Azure ExpressRoute and Azure Private Link offer unique advantages. Azure ExpressRoute provides more reliability and faster speeds than typical internet connections. Azure Private Link, however, ensures secure and private connectivity while allowing you to extend your own services privately to consumers.
Practical Applications of Azure Private Link
Use Cases in Various Industries
Azure Private Link finds applications across various industries, enhancing security and compliance. Here are some notable use cases:
- Healthcare: In the healthcare sector, Azure Private Link protects sensitive patient data. It restricts traffic to known, approved networks, ensuring that only authorized personnel access critical information. This approach is essential for accessing healthcare databases and services without exposing them to the public internet.
| Evidence Description | Source |
|---|---|
| Azure Private Link restricts traffic to known, approved networks, enhancing security for patient data. | Securing Patient Data in the Cloud |
| Private Link is essential for accessing healthcare databases and services, ensuring they are not exposed to the public internet. | Azure for Healthcare: Compliance and Security Considerations |
| Azure Private Link allows secure access to Azure Health Data Services, protecting sensitive health data by using a private IP address. | Configure Azure Private Link for secure Azure Health Data Services access |
-
Finance: Financial institutions utilize Azure Private Link to secure transactions and customer data. By keeping sensitive information off the public internet, they reduce the risk of data breaches and comply with regulations like PCI DSS.
-
Retail: Retailers leverage Azure Private Link to connect their e-commerce platforms securely. This ensures that customer payment information remains protected during transactions.
Integration with Azure Services
Azure Private Link seamlessly integrates with various Azure services, enhancing their security and accessibility. Here are some key services that benefit from this integration:
| Azure Services Integrated with Private Link |
|---|
| App Service (Web App, Function App) |
| Blob Storage |
| Storage Static Website |
| Internal load balancers |
| API Management |
| Application Gateway |
| Azure Container Apps |
Integrating Azure Private Link with services like Azure SQL Database and Azure Storage provides several advantages:
- Private Connectivity: You access Azure services over a private connection within your virtual network.
- Isolation from Public Internet: Traffic remains isolated from unauthorized access, minimizing risks.
- Secure by Default: Connections are encrypted, and access is controlled, enhancing overall security.
- Subnet-Level Access Control: You can enforce specific access policies, allowing granular control over which subnets can access the service.
By utilizing Azure Private Link, you enhance the security of your Azure services while simplifying network management. This integration allows you to focus on your core business while ensuring that your data remains protected.
In summary, Azure Private Link plays a crucial role in enhancing your security posture. It ensures that your data traffic remains private and does not traverse the public internet. By connecting to private endpoints, you significantly reduce the risk of data leakage. Here are some key takeaways:
- Each private endpoint links to a specific PaaS resource, blocking access to others.
- End-to-end encryption secures your traffic, keeping it private and unreadable to unauthorized entities.
- Azure Private Link helps you meet compliance requirements, such as GDPR and HIPAA.
By implementing Azure Private Link, you can confidently secure your cloud resources and simplify your network architecture. Consider integrating this service into your cloud strategy for a more robust security framework.
FAQ
What is Azure Private Link?
Azure Private Link is a service that provides secure and private connectivity to Azure services. It allows you to connect to Azure resources without exposing them to the public internet.
How does Azure Private Link enhance security?
Azure Private Link keeps your data traffic isolated from the public internet. This reduces the risk of data interception and ensures compliance with regulations like GDPR and HIPAA.
Can I use Azure Private Link with third-party services?
Yes, Azure Private Link allows you to publish your own applications privately. This feature enables secure connectivity to third-party services without exposing them to the public internet.
What are private endpoints?
Private endpoints are virtual network interfaces that connect you to Azure services privately. They receive a private IP address from your subnet, ensuring that traffic remains within your virtual network.
How do I set up Azure Private Link?
To set up Azure Private Link, you need an Azure subscription, an active ExpressRoute circuit or VPN connection, and a virtual network in the same region as your Azure services.
Is there a cost associated with Azure Private Link?
Yes, Azure Private Link has a pricing model that includes charges for private endpoints and data transfer. However, the Private Link Service itself does not incur additional costs.
What industries benefit from Azure Private Link?
Industries such as healthcare, finance, and retail benefit from Azure Private Link. It enhances security and compliance by keeping sensitive data off the public internet.
How does Azure Private Link compare to Azure VPN?
Azure VPN uses the public internet for connections, while Azure Private Link keeps traffic within Microsoft's network. This makes Azure Private Link more secure and often provides better performance.
🎧 Listen to this episode
Want a practical explanation of Azure Private Link? This episode breaks down the topic in clear language and shows why it matters for Microsoft 365, Azure, Power Platform, security, AI, and modern work.
Listen to this episode if you want to:
- Understand the key concepts behind Azure Private Link
- See how it fits into the wider Microsoft technology ecosystem
- Learn where it can create practical value for your organization
You may also enjoy these related M365 FM episodes:
- Private RAG Security: Authorization-Aware Data Retrieval
- Private LoRA for Secure AI on Proprietary Enterprise Data
- How to Build Private RAG with SharePoint and n8n
- Synapse Link vs Dataflows Gen2 for Dataverse Pipelines
- Speed SharePoint with the Microsoft 365 Private CDN
Discover more practical Microsoft conversations on M365 FM.
Last reviewed: July 2026.
Who Should Listen
This episode is for Microsoft 365 administrators, architects, IT leaders, and practitioners who need a practical understanding of Azure Private Link before planning, implementing, or supporting it.
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Welcome to another episode of Microsoft Knowledge Nudgets here on M365.
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FM, I'm your host, Mirko Peters.
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Today's topic is one that almost everyone has heard of,
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but few can explain clearly.
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Azure Private Link.
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You've probably seen the option when setting up a storage account
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or a SQL database.
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But what does it actually do?
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And do you really need it?
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Here's the thing most people get wrong.
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They assume that because the service runs inside Azure,
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it's automatically private,
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that it somehow walled off from the internet by default.
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That's not true, not even close.
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Most as your past services, storage, SQL, key vault,
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they ship with a public endpoint right out of the box.
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That means anyone on the internet can reach them
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as long as they have the right URL and credentials.
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By the end of this episode,
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you'll understand what private link actually is,
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why it exists and how it keeps your traffic off the public internet.
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We'll break it down using simple analogies.
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No marketing fluff, no jargon, just plain English.
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The old way, public endpoints everywhere.
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Let's start with the problem.
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Before private link existed, every Azure PASS service
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got a public endpoint by default.
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You create a storage account,
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Azure gives you something like my storage account.
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Blob.co.windows.net,
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that URL resolves to a public IP address.
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Anyone with internet access can try to connect to it.
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Now imagine you have a virtual machine running inside your own
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Azure Virtual Network,
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that VM needs to read some files from Blob Storage.
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You'd think the traffic would stay inside Azure, right?
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Both resources are in the same cloud,
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but that's not how it works.
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The VM has to leave your virtual network
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go out over the public internet
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and then come back into Azure to reach that storage account.
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It's like you're standing in one room of an office building
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and you need to get something from the supply closet in the same building.
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But instead of walking down the hallway,
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you have to go outside, walk around the block,
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and come back in through a different door.
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It makes no sense, but that's exactly what was happening.
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This is a real problem.
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Your data is traveling over the public internet.
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Even though both resources are sitting inside Microsoft's own data centers,
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that traffic is encrypted, sure.
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But it's still exposed to the open internet.
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It's still passing through routers and switches that you don't control.
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And if someone managed to intercept that traffic,
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they could see what you're sending.
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There's a common myth here.
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A lot of people think,
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well, it's in my subscription, so it's private.
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That's not how it works.
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Your subscription is a billing and management boundary,
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not a network boundary.
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By default, your Azure services are reachable from the internet.
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The only thing protecting them is the authentication and authorization layer,
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the keys, the passwords, the firewall rules.
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But the network path itself is public.
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So Microsoft looked at this and said,
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there has to be a better way.
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And they built it.
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They called it private link.
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The solution, private endpoint as a network interface card.
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Private link is the overall service,
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but the core piece you need to understand is the private endpoint,
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a virtual network interface card or NIC that sits inside your virtual network
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and connects to a past service.
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Here's how it works.
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You create a private endpoint for your storage account,
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and as your builds a virtual nick inside your virtual network
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with a private IP from your subnet,
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that NIC connects to the storage account through private link on the backend.
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So from your VM's viewpoint, the storage account now looks like it lives inside your own network
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with a private IP, just like any other resource.
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When your VM sends traffic to that storage account,
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it hits the private IP of the NIC and travels over the Microsoft backbone network.
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Never the public internet.
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It never leaves Azure's internal infrastructure.
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Think of it like that secure hallway in the office building.
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Instead of walking outside and around the block, you just walk down the corridor into the supply closet.
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Direct connection, no detour.
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Now here's a nuance, a lot of people miss.
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Enabling a private endpoint does not turn off the public endpoint automatically.
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They can both exist at the same time.
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If you create a private endpoint,
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but never touch the public endpoint settings,
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your storage account is still reachable from the internet.
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You have to explicitly disable public network access to lock it down completely.
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Many people think creating the private endpoint is enough.
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It's not.
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You have to tell Azure, I only want private access.
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Let me clear up another myth while we're here.
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Private link is not the same as a VPN or express route.
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They solve different problems and we'll get into that comparison later.
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For now, just know private link is about accessing a specific service,
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not connecting your whole network to Azure.
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So you've got your private endpoint and your VM can reach the storage account over a private IP.
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But how does your VM actually find that storage account?
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It used to resolve the public URL to a public IP.
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Now it needs a private IP.
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How does that work?
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That's where DNS comes in and that's what we'll look at next.
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DNS, the secret source that makes it all work.
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So you've got your private endpoint and your VM can reach the storage account over a private IP.
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But here's the thing, your VM doesn't know that IP.
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It knows the storage accounts URL, something like my storage account,
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blob.core.windows.net, that's the name it uses to connect.
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So how does it find the private IP instead of the public one?
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This is where DNS does the heavy lifting.
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When you create a private endpoint and choose to integrate with a private DNS zone,
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which you should Azure automatically creates one for you.
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For a blob storage account, that zone is called private link, blob.core.windows.net.
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Inside that zone, Azure adds an A record that maps your storage account name to the endpoint's private IP.
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Now here's the clever part.
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The original public URL still resolves.
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But instead of returning a public IP directly, it returns a name record that points to the private zone.
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So the resolution chain goes like this, your VM asks for the storage account URL, DNS returns at
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C name pointing to my storage account, private link.blog.core.windows.net,
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which lives in the private DNS zone linked to your virtual network.
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DNS resolves it to the private IP, your VM connects to that private IP,
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and traffic never touches the public internet.
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Think of it like a reception desk in an office building.
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Someone walks in and asks for the supply closet,
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and the receptionist doesn't send them outside.
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They point them to the correct hallway inside.
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The private DNS zone is that receptionist redirecting traffic to the right place without leaving the building.
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Now how this works depends on where your VM is.
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If it's in the same virtual network as the private endpoint, the private DNS zone is linked.
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So resolution happens automatically.
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If it's in a peer network, you need to link the zone to that peer network too.
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For on-premises machines through VPN or ExpressRoute, it gets more involved.
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You typically set up a DNS forwarder or use Azure DNS private resolver to make sure queries reach the private zone.
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But for most scenarios inside Azure, the basics are handled for you.
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DNS can get complex in larger environments, but for the standard case,
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a VM in the same virtual network as the private endpoint.
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Azure handles it automatically.
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You don't need to touch a thing.
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Let's see this in action with a real example.
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Real-world walkthrough, private link with Azure storage.
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Let's make this real.
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Say you've got a virtual machine running inside your Azure virtual network.
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That VM needs to grab files from an Azure blob storage account.
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It's a common setup.
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Maybe an app storing user uploads, or a data processing job reading from a container.
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Without private link, here's what happens.
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Your VM looks up to storage accounts, public URL, and gets a public IP address.
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Traffic leaves your virtual network, goes out over the public internet,
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then re-enters Azure to reach the storage account.
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That run trip is unnecessary.
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Both resources are already in Azure, but the data takes a detour through the open internet anyway.
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With private link, you deploy a private endpoint for the storage accounts, blob sub-resource.
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That's the specific part that handles blob data.
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Azure creates a virtual niki in your virtual network with a private IP,
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sets up the private DNS zone and the whole DNS resolution chain we talked about kicks in.
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Now when your VM resolves the same URL, my storage account, blob.co.windows.net.
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It gets the private IP instead of the public one.
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Traffic flows from the VM to the private endpoint,
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then over the Microsoft backbone to the storage account.
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It never leaves Azure's internal network.
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Here's the key point.
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Your application doesn't change.
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No modifying connection strings, no updating config files,
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the URL stays the same.
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The only thing that changes is how that URL resolves.
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From the app's perspective, it's still connecting to the same storage account.
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But behind the scenes, the traffic path is completely different.
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And if you want to go all the way, you can disable the public endpoint entirely.
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That means your storage account is only reachable through the private endpoint.
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Zero internet exposure.
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No one can even attempt to connect from the outside.
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One more thing worth noting.
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Storage accounts have multiple sub-resources.
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Blob is one, but there's also file, table and queue.
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Each one can have its own private endpoint.
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You could have one for blob traffic and a separate one for file traffic.
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Or use a single endpoint that covers all of them, depending on your needs.
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Now you might be wondering, how is this different from other Azure connectivity options?
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VPN, express route, service endpoints.
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They all sound similar.
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Let's clear that up.
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Private link versus VPN versus express route versus service endpoints.
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So how does private links stack up against VPN, express route and service endpoints?
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They all sound like they do the same thing, but they're actually solving different problems.
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And in many cases, you'd use them together.
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Start with VPN.
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A virtual private network connects your on-premises network to Azure
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over the public internet.
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It creates an encrypted tunnel between your site and Azure.
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Traffic is encrypted, sure, but it's still traveling over the public internet.
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The tunnel is secure that the road it's on is public.
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Private link doesn't replace VPN.
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It works alongside it.
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You might use a VPN to connect your office to Azure, then use private link to access your
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storage account privately from that connection.
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Express route is different.
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It gives you a dedicated private circuit from your data center to Azure.
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Traffic never touches the public internet at all.
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It's like having your own private road straight into Microsoft's network, but here's the catch.
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Express route alone doesn't give you private access to past services.
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It connects your network to Azure, but your storage account still has a public endpoint.
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You'd combine express route with private link to get true private access to those services.
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Service endpoints are an older technology.
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They let you restrict access to an Azure service, so only traffic from your virtual network
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can reach it.
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But here's the thing, the service still has a public endpoint.
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You're just adding a firewall rule that says, only allow traffic from this vnet.
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The endpoint itself is still exposed to the internet.
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Private link is more secure because the endpoint is truly inside your vnet.
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It has a private IP.
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There's no public endpoint to attack.
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Let me give you a simple way to think about it.
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VPN is a secure tunnel through a public road.
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Express route is a private road that goes straight to Azure.
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Service endpoints are a guard at the public gate who checks IDs.
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Private link is a direct hallway inside the building.
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You never go outside at all.
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So which one should you use?
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It depends.
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For connecting your office to Azure, VPN or express route are your options.
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For accessing past services privately, private link is the gold standard.
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And for the strongest security, combine them.
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Express route to get your traffic into Azure privately, then private link to access your
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services privately from there.
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But private link isn't just for Microsoft services.
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You can also use it for your own applications, private link service, hosting your own private
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endpoints.
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Here's something a lot of people miss.
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Private link isn't just for consuming Azure services.
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You can also use it to expose your own applications to the world.
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That's exactly what private link service was built for.
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Imagine your as-sass provider.
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You've got an application running on virtual machines behind a standard load balancer
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and your customers need access.
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Traditionally, you had two options.
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Expose everything to the internet or set up a VPN between your network and theirs.
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Both have big downsides.
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Public exposure opens you up to security risks and VPNs are complex to manage and maintain.
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Private link service cuts through that.
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You create the service, attach it to your standard load balancer, and then your customers
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can create a private endpoint in their own virtual network.
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Private endpoint connects directly to your service.
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No peering, no VPN and absolutely no public exposure.
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The traffic travels from their private endpoint across the Microsoft backbone straight to your
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service.
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It never touches the internet.
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Your service gets a globally unique alias, something like my app, guid.region.
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Azure, private link service.
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That alias is what customers use to connect.
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And you're in full control over who can see it.
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You can restrict visibility by our back roles, specific subscriptions, or let anyone with
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the alias request a connection.
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Every connection request comes to you for manual approval so you always know exactly who's
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connecting.
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For SAS providers, this is a huge shift instead of opening firewall rules or managing
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complex VPN configurations, you just hand your customer the alias.
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They create a private endpoint, you approve it, and that's it.
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Done.
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One limitation though.
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Private link service only works with standard load balancer is not basic.
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If you're still on a basic load balancer, you'll need to upgrade first.
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That's a small price to pay for the security and simplicity you get in return.
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Now all the security sounds great.
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But what does it actually mean for your compliance needs and your budget?
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Security, compliance, and cost considerations.
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Let's talk about what private link really means for your compliance requirements and your
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wallet.
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First, the security side.
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Private link reduces your attack service by eliminating public endpoints entirely.
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That's the headline benefit.
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Instead of a storage account or SQL database reachable from anywhere on the internet, you've
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got a resource that only responds to traffic from inside your virtual network.
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No public IP to scan, no open port to probe.
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The attack service shrinks dramatically.
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There's another benefit that doesn't get enough attention, data leakage prevention, each
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private endpoint maps to a specific resource instance.
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Not the whole service, not every storage account in your subscription.
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Just that one.
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So if someone compromises a workload in your virtual network, they can't use that private
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endpoint to reach other storage accounts.
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They're locked to the one resource you approved.
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For security teams, that containment is a big deal.
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On the compliance front, private link checks a lot of boxes.
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Regulations like HIPAA, GDPR, and PCI often require that sensitive data never travels
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over public networks.
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Private link gives you a clean way to prove that.
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Your traffic stays on the Microsoft backbone and you can point to the audit logs and say,
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"Here's the proof."
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For regulated industries, that alone can justify the investment.
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Now let's talk about cost because this is where people get surprised.
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Private link is not free.
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You pay a per hour charge for each private endpoint plus data processing fees for the traffic
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that flows through it.
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Depending on your usage, it can be two to three times more expensive than using a public
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endpoint with firewall rules.
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That adds up quickly, especially if you have many endpoints.
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So here's the honest take.
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Private link isn't always the right choice.
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If you're running a dev or test environment with no sensitive data, public endpoints with
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proper firewall rules are probably fine.
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If you're hosting a public website meant to be accessible from the internet, private link
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doesn't help you.
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But for production workloads in regulated industries, finance, healthcare, government, private
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link is often mandatory.
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It's the cost of doing business securely.
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Now before you implement this, there are a few gotchas to watch out for.
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Implementation gotchas.
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What beginners miss?
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Let me save you some headaches.
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There are the most common mistakes people make when they first set up private link.
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First up, you have to disable the public endpoint after creating the private endpoint.
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This is the biggest gotcha.
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A lot of people create the private endpoint and assume that's enough, but it's not.
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The public endpoint stays active by default, which means your traffic can still go over
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the internet.
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You have to go into the networking settings and explicitly turn off public network access.
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If you skip the step, you haven't actually secured anything.
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Next, DNS resolution for on-premises clients requires extra setup.
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If you've got machines in your office connecting through a VPN or express route, they won't automatically
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resolve your private endpoints IP.
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The private DNS zone is linked to your Azure virtual network, not to your on-premises DNS
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servers.
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You need to set up a DNS forwarder or use Azure DNS private resolver to make those queries
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reach the private zone.
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A lot of people overlook this and then wonder why their on-premises apps can't connect.
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Also, private endpoints don't magically work across regions.
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If your virtual network is in West Europe and you create a private endpoint for a storage
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account in East US, it won't work.
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The private endpoint has to be in the same region as the virtual network.
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The past service can be in a different region, but the endpoint itself must match the vnet's
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region, plan accordingly.
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One more thing, network security groups affect the private endpoint, NIC.
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The private endpoint creates a virtual ennick in your subnet.
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That NIC is subject to the same NSG rules as anything else in that subnet.
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If you block traffic to the NIC subnet, the endpoint won't work.
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Make sure your NSG rules allow the traffic you need.
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The most common mistake overall, creating the endpoint but forgetting to update DNS for
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on-prem users.
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You set everything up perfectly in Azure.
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Your VMs can reach the storage account privately, but your on-premises team calls and says
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nothing works.
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That's because their DNS servers don't know about the private zone.
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Fix that first and you'll save yourself a lot of troubleshooting.
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Let's wrap up with a simple takeaway.
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Here's what you need to remember.
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Azure Private Link lets you place private endpoints inside your virtual network.
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Those endpoints connect to past services like storage and SQL over the Microsoft backbone.
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Next stays off the public internet, that's the core idea.
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You don't need to remember every detail we covered today.
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Just understand this one thing.
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Azure services don't have to be public.
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By default they are, but they don't have to be.
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Private Link gives you a way to change that.
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Here's your challenge.
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Next time you deploy an Azure service that holds sensitive data, ask yourself one question.
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Should this be reachable from the internet?
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If the answer is no, you know what to do.
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If this episode helped you connect the dots, share it with a colleague who's new to Azure
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and hit subscribe.
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Next time we'll look at how to combine private link with ExpressRoot for maximum security.
Founder of m365.fm, m365.show and m365con.net
Mirko Peters is a Microsoft 365 expert, content creator, and founder of m365.fm, a platform dedicated to sharing practical insights on modern workplace technologies. His work focuses on Microsoft 365 governance, security, collaboration, and real-world implementation strategies.
Through his podcast and written content, Mirko provides hands-on guidance for IT professionals, architects, and business leaders navigating the complexities of Microsoft 365. He is known for translating complex topics into clear, actionable advice, often highlighting common mistakes and overlooked risks in real-world environments.
With a strong emphasis on community contribution and knowledge sharing, Mirko is actively building a platform that connects experts, shares experiences, and helps organizations get the most out of their Microsoft 365 investments.
