What is Azure Private Link?
Azure Private Link is a service that lets you privately access supported Azure services and some partner or customer services over a private endpoint inside your virtual network.
In simple terms, Private Link helps you keep service traffic on private addressing instead of relying on a public endpoint path. This is useful when you want tighter control, reduced exposure, and more private connectivity patterns in Azure.
Many teams first encounter Private Link when they want to privately access services such as Azure Storage, Azure SQL Database, App Service, or other supported services from an Azure VNet.
Why Azure Private Link matters
Public endpoints can still be secured, but many organizations want stronger private-access patterns for sensitive services, internal platforms, regulated workloads, or data-plane traffic that should not depend on public exposure.
Private service access
Reach supported services using private IP addressing inside your VNet.
Reduced exposure
Traffic can avoid public internet exposure patterns and stay on private service access designs.
Enterprise security posture
Private Link fits well into regulated, security-conscious, and private-first architectures.
Hybrid alignment
It helps support designs where on-premises users reach Azure services through private network paths.
Clear service boundaries
It helps separate private service consumption from public endpoint consumption.
Better design clarity
Private Link often makes architecture intent clearer for internal or protected service access.
Azure Private Link in the 5 Ws
What is Azure Private Link?
It is Azure’s private access model for supported services, typically consumed through a private endpoint in your virtual network.
Why do teams use it?
Teams use it to reach services privately, reduce public exposure, support compliance needs, and simplify private service access patterns.
When should you use it?
Use Private Link when a service should be accessed privately from Azure VNets or hybrid-connected environments instead of relying primarily on public endpoint access.
Where does it fit?
It fits inside your Azure network design wherever services like storage, databases, or internal apps need private access.
Who works with it?
Cloud engineers, Azure administrators, platform teams, security teams, architects, and DevOps teams all work with Private Link designs in real Azure environments.
How does it work?
A private endpoint is created inside your subnet, receives a private IP from that subnet, and maps privately to the target Azure service or Private Link-enabled service. DNS then needs to resolve the service name to that private IP.
Private Link vs Private Endpoint
These terms are often used together, but they are not the same thing.
| Term | What it means | Simple explanation |
|---|---|---|
| Azure Private Link | The private connectivity model for supported services | The overall private service access concept |
| Private Endpoint | A network interface in your VNet with a private IP | The actual private attachment point you create and use |
How Azure Private Link works
A private endpoint is placed into a subnet in your VNet. It receives a private IP address from that subnet. Traffic from your clients then reaches the service through that private endpoint instead of relying on the public endpoint path.
Private Link idea
Client in VNet
↓
Private DNS resolves service name
↓
Service name points to private endpoint IP
↓
Traffic goes to private endpoint
↓
Private access to Azure serviceWhat actually gets created
- a private endpoint object
- a private IP from the subnet
- an association to the target service and subresource
- usually private DNS records or private DNS zone linkage
Why DNS matters for Azure Private Link
DNS is one of the most important parts of Private Link. Many deployment issues happen because teams create the private endpoint successfully but the client still resolves the public service hostname instead of the private endpoint IP.
What DNS needs to do
The service hostname needs to resolve to the private endpoint IP address from your VNet path. If it still resolves to the public endpoint, the private path is not really being used by the client.
Why this matters so much
- the application may still try to use the public endpoint
- firewall and routing expectations may not match the real traffic path
- hybrid clients may fail if private DNS is not linked correctly
- teams may think Private Link is broken when the real problem is only name resolution
Common Azure Private Link use cases
Private access to storage
Allow applications to reach Azure Storage privately from inside the VNet.
Private access to Azure SQL
Allow app workloads to reach database services privately without relying on public endpoint access.
Private access to App Service
Allow private inbound access to applications from approved network paths.
Internal platform services
Use private endpoints so shared services remain reachable only through private networking designs.
Hybrid enterprise use
Allow on-premises-connected clients to reach supported Azure services through private IP resolution and network paths.
Compliance and private-first patterns
Support regulated environments where reducing public exposure is part of the design requirement.
Real-world Azure Private Link examples
Example 1: Private application data access
An application in one subnet accesses Azure SQL or Azure Storage through private endpoints so the data path stays private.
Example 2: Internal enterprise web app
A company uses Private Link for an App Service app so only private-network clients can access it through approved internal paths.
Example 3: Shared platform service
A platform team exposes supported services privately to spoke VNets while keeping the service consumption model private-first.
Example 4: Hybrid private access
On-premises-connected users resolve Azure service names to private endpoint IPs and reach the services over private connectivity instead of public internet paths.
Example 5: Security-conscious landing zone
A landing zone architecture uses private endpoints for data services and internal apps so the design remains aligned with strict enterprise controls.
Azure Private Link best practices
- Plan private endpoint placement carefully.
- Use clear subnet purpose and naming for private endpoint hosting.
- Validate DNS behavior early during testing.
- Know which subresource you need for the target service.
- Keep private access design aligned with NSG and route behavior.
- Document which services use Private Link and how clients should resolve them.
- Test from the actual client network path, not only from the portal.
- Be intentional about whether public network access remains enabled or restricted.
Common Azure Private Link mistakes
Ignoring DNS
The most common mistake is creating the private endpoint but leaving clients resolving the public endpoint.
Wrong subresource choice
Some services expose multiple subresources and the wrong selection can break the intended design.
Wrong subnet expectations
Private endpoint placement still depends on proper subnet planning and network assumptions.
No client-path testing
Portal success does not guarantee the actual application path resolves and connects correctly.
Confusing Private Link with NSG or routing issues
The issue may look like Private Link but the real problem may still be DNS, NSG, or path design.
No architecture alignment
Private Link should support the overall private-access model, not be bolted on without a clear plan.
Troubleshooting Azure Private Link issues
When Private Link connectivity fails, the most important thing is to verify the entire private-access chain, not only whether the endpoint exists.
Basic troubleshooting sequence
- Check whether the private endpoint is created and approved correctly.
- Check whether the correct service and subresource were selected.
- Check DNS resolution from the actual client path.
- Confirm the hostname resolves to the private endpoint IP, not the public endpoint.
- Review NSG and routing assumptions around the client subnet.
- Validate the service-side access design and whether public access settings affect the expected behavior.
Useful troubleshooting questions
- Is the client resolving the service name to the private IP?
- Was the correct private endpoint subresource chosen?
- Is the private endpoint in the intended subnet?
- Is there any unexpected NSG or routing behavior affecting the client path?
- Is the application still configured to use a public hostname or public expectation?
Troubleshooting mindset
Private Link issue?
├─ Check private endpoint state
├─ Check subresource choice
├─ Check DNS resolution
├─ Check private IP path
├─ Check NSG / route assumptions
└─ Check client application behaviorFrequently asked questions
What is Azure Private Link in simple words?
It is Azure’s private service access model that lets supported services be accessed privately through a private endpoint in your VNet.
What is a private endpoint?
It is a network interface with a private IP address from your subnet that connects privately to a supported service.
Why is DNS important for Private Link?
Because the service hostname usually needs to resolve to the private endpoint IP address instead of the public endpoint.
Does Private Link replace NSGs or route tables?
No. Private Link provides private service access, while NSGs filter traffic and route tables direct traffic paths.
Can Private Link be used for Azure Storage or Azure SQL?
Yes. These are common examples of services frequently used with private endpoints.
What usually breaks Private Link connectivity?
DNS misconfiguration, wrong subresource choice, wrong client path assumptions, or broader network design issues are common causes.
Official Microsoft Azure documentation
These official Microsoft Azure references are useful if you want deeper platform details, implementation guidance, and service-specific documentation for Azure Private Link and Private Endpoints.
- What is Azure Private Link?
- What is a private endpoint?
- Azure Private Endpoint DNS values
- Azure Private Link documentation hub
- Quickstart: Create a private endpoint