Azure Private Endpoint changes the network path to a platform service by placing a private IP address from your virtual network on the connection. The service is still a managed Azure service, but clients can reach it through a private address instead of relying on its public endpoint. The networking part is only half the design. DNS must resolve the service name to the private endpoint address for the private path to be used reliably.<\/p>\n
That is why private endpoint troubleshooting so often looks like a DNS problem: the resource exists, the network interface has an address, and the service is healthy, yet the client resolves the normal public address and never uses the private path. For an AZ-104<\/a> administrator, the key is to design Private Link and name resolution together rather than configuring the endpoint first and \u201cfixing DNS later.\u201d<\/p>\n A private endpoint is a network interface associated with a private IP address in a subnet. It represents a private connection to a supported Azure service or private-link resource. The client continues to use the service\u2019s normal fully qualified domain name, but DNS should ultimately resolve that name to the private endpoint IP for clients that are meant to use the private connection.<\/p>\n This model avoids exposing the application\u2019s data path to the public internet and makes network controls easier to reason about. Traffic from the virtual network to the service can remain on the Microsoft backbone, and the resource can often be configured to restrict or disable public network access. The endpoint is therefore both a routing construct and an access-design decision.<\/p>\n Private endpoints do not make all traffic \u201cprivate\u201d by magic. They apply to the specific service and subresource configured for Private Link. Administrators still need to understand subnet routing, network security, service firewalls, identities, and the public-access setting. A well-designed private endpoint complements those controls instead of being treated as a replacement for them.<\/p>\n The endpoint also has an approval state. Depending on the service and ownership model, the connection can be approved automatically or require approval by the resource owner. That matters in cross-subscription designs where the network team creates an endpoint but another team owns the target service. The deployment workflow should account for approval rather than assuming creation alone makes the connection usable.<\/p>\n Most applications connect to Azure services by DNS name rather than by hard-coded IP address. Without Private Link, that name typically resolves to a public service endpoint. With a private endpoint, the goal is for clients in the intended network context to resolve the same service name to the endpoint\u2019s private IP. That preserves the application configuration while changing the network path.<\/p>\n Microsoft\u2019s Private Endpoint guidance is explicit that DNS configuration is critical. The private endpoint network interface contains the FQDN and private IP information needed for name resolution. In many services, Azure uses a recommended A broader explanation of Azure DNS<\/a> helps clarify why the resolver\u2019s view matters. DNS is not just a directory entry attached to the endpoint; it is the mechanism that determines whether a client discovers the public or private address when it asks for the service by name.<\/p>\n Applications should continue using the service FQDN rather than pinning the private endpoint IP. The address is an implementation detail that can change if the endpoint is recreated. Keeping the FQDN in application configuration lets Azure DNS and the private zone carry that change without requiring a new software deployment every time network infrastructure is replaced.<\/p>\n Azure Private DNS zones can hold the A records that map private-link service names to private endpoint addresses. Linking the zone to a virtual network allows workloads in that VNet to resolve records from the zone through Azure-provided DNS. A private DNS zone group associated with the private endpoint can manage the relevant records as the endpoint changes.<\/p>\n The zone name must match the Azure service\u2019s documented Private Link DNS pattern. Inventing a convenient internal zone or overriding the service\u2019s public zone can create subtle failures. Microsoft specifically cautions against overriding an active public DNS zone without the required forwarding behavior because clients may lose the ability to resolve public instances of the service.<\/p>\n Record lifecycle is also important. If endpoints are added, removed, or regionalized, the DNS records must remain aligned with the actual private endpoint addresses. A zone group can reduce manual drift. Treating records as a one-time setup task creates the risk that DNS continues pointing at a deleted or replaced endpoint long after the network configuration has changed.<\/p>\n Zone links also define who can see the private namespace. Linking a zone to a VNet makes its records available through Azure-provided DNS for that network, so the link itself is part of access architecture. Review links during network decommissioning; leaving a shared zone linked to an old or repurposed VNet can expose private names to workloads that no longer need them.<\/p>\n VNet peering provides IP connectivity between peered networks, but DNS zone links are not automatically inherited merely because two VNets can route to each other. If a workload in a peered VNet needs to resolve the private endpoint name, the DNS architecture must make the private zone answer available to that workload.<\/p>\n One approach is to link the private DNS zone to each relevant VNet when the design is simple and within supported limits. Larger hub-and-spoke environments often centralize DNS resolution and forwarding. The important point is that network reachability and name resolution are independent checks: a TCP path can exist while the application still connects to a public address because DNS returned the wrong result.<\/p>\n The networking depth associated with AZ-700<\/a> becomes useful in these environments because peering, custom DNS, hub-and-spoke routing, and hybrid resolution interact. Private Link should fit the network architecture rather than creating a separate DNS exception for every application team.<\/p>\n Centralized DNS is often easier to operate than linking every application zone everywhere, but centralization creates a critical shared dependency. Resolver availability, forwarding rules, and ownership must match the importance of the services that depend on them. A hub that centralizes routing but leaves DNS fragmented across application teams can still produce inconsistent private endpoint behavior.<\/p>\n On-premises systems do not automatically know about Azure Private DNS zones. If a datacenter client must reach a private endpoint by its normal service FQDN, the DNS request needs a path to an Azure resolver that can answer from the linked private zone. This is where conditional forwarding, a DNS forwarder, or Azure DNS Private Resolver becomes part of the design.<\/p>\n Microsoft documents several supported scenarios, including on-premises DNS forwarding through Azure and architectures based on Azure DNS Private Resolver. The resolver or forwarder should be reachable through the hybrid network connection, and the conditional forwarding rule should use the documented public service zone in the way Microsoft recommends rather than blindly forwarding the DNS caching can make troubleshooting confusing after changes. A client or intermediate resolver may continue using an older answer until its TTL expires. Understanding DNS caching<\/a> is therefore practical when a newly created private endpoint appears correct in Azure but some clients continue reaching the old address.<\/p>\n Test the hybrid path from the real on-premises resolver chain, not only from an Azure VM. A query can succeed inside the linked VNet while the corporate DNS server forwards the same name to a public resolver. Capturing the response at each hop\u2014client, on-premises resolver, forwarder or Private Resolver, and private zone\u2014makes the failure point visible.<\/p>\n Creating a private endpoint does not automatically prove that the public endpoint is unusable. Many Azure services expose a separate setting that controls public network access or service firewall behavior. If the requirement is \u201cthis workload must be reachable only through Private Link,\u201d the design should validate both sides: the private path works, and the public path is restricted according to policy.<\/p>\n This distinction matters during migration. Teams often create a private endpoint while leaving public access enabled temporarily so they can move clients in stages. That can be reasonable, but the temporary state should be visible and time-bound. Otherwise the organization believes it has implemented a private-only architecture while a public route remains available indefinitely.<\/p>\n Identity controls remain important too. A private IP address changes network reachability; it does not grant data-plane authorization. Storage, databases, vaults, and other services still evaluate the caller\u2019s credentials and permissions. Private Link is one layer in a defense-in-depth design.<\/p>\n Service firewalls and private endpoints should be reviewed together during hardening. Some teams keep \u201cselected networks\u201d public access enabled for administrative convenience even after application traffic is private. If that exception is required, document the permitted source and owner. If it is not required, removing the public path reduces ambiguity and makes future connectivity tests easier to interpret.<\/p>\n Private DNS becomes more complex when many applications create endpoints for the same Azure service across different networks or subscriptions. Records for the same private-link zone need to be visible from the clients that should use them, but indiscriminately linking every zone to every VNet can create ambiguity, ownership problems, and accidental record conflicts.<\/p>\n Microsoft warns against associating a single-service private DNS zone in ways that cause records for different private endpoints to overwrite or interfere with one another. Large environments should define who owns private zones, how applications request records, and whether DNS is centralized in a connectivity subscription or managed with the workload.<\/p>\nA private endpoint brings a service address into your virtual network<\/h3>\n
DNS is what makes the application choose the private path<\/h3>\n
privatelink<\/code> private DNS zone and the normal public name follows a CNAME chain that can be answered privately inside the linked network.<\/p>\nPrivate DNS zones provide the private answer<\/h3>\n
Peered virtual networks need DNS visibility as well as IP connectivity<\/h3>\n
Hybrid clients need a resolver path into Azure<\/h3>\n
privatelink<\/code> zone from the wrong context.<\/p>\nPublic network access is a separate security decision<\/h3>\n
Multiple endpoints and services require disciplined zone design<\/h3>\n