Add IAzurePrivateEndpointTarget support to AzureOpenAIResource and FoundryResource by Copilot · Pull Request #15945 · microsoft/aspire

Copilot · 2026-04-07T22:11:54Z

Description

AzureOpenAIResource and FoundryResource now implement IAzurePrivateEndpointTarget, enabling private endpoint connectivity.

AzureOpenAIResource: group ID "account", DNS zone "privatelink.openai.azure.com"
FoundryResource: group ID "account", DNS zone "privatelink.cognitiveservices.azure.com"
Both resources gain a BicepOutputReference Id property and emit the id bicep output in their infrastructure configuration
Bicep-baseline tests verify the generated private endpoint bicep output for both resources via Verify snapshots in AzurePrivateEndpointLockdownTests

var vnet = builder.AddAzureVirtualNetwork("myvnet");
var subnet = vnet.AddSubnet("pesubnet", "10.0.1.0/24");
var openai = builder.AddAzureOpenAI("openai");
var pe = subnet.AddPrivateEndpoint(openai);

Checklist

Is this feature complete?
- Yes. Ready to ship.
- No. Follow-up changes expected.
Are you including unit tests for the changes and scenario tests if relevant?
- Yes
- No
Did you add public API?
- Yes
  - If yes, did you have an API Review for it?
    - Yes
    - No
  - Did you add <remarks /> and <code /> elements on your triple slash comments?
    - Yes
    - No
- No
Does the change make any security assumptions or guarantees?
- Yes
  - If yes, have you done a threat model and had a security review?
    - Yes
    - No
- No
Does the change require an update in our Aspire docs?
- Yes
  - Link to aspire.dev issue:
    - New issue
- No

…undryResource Agent-Logs-Url: https://github.com/microsoft/aspire/sessions/c060fb13-56b1-4905-9cbc-b78a181f5062 Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

eerhardt · 2026-04-07T22:36:10Z

tests/Aspire.Hosting.Azure.Tests/AzurePrivateEndpointExtensionsTests.cs

    }
+
+    [Fact]
+    public void AzureOpenAIResource_ImplementsIAzurePrivateEndpointTarget()


@copilot - make better tests here. Instead of just checking it implements the interface, baseline the bicep produced when using these resources as private endpoints.

Replaced the simple interface-check tests with proper bicep-baseline tests in AzurePrivateEndpointLockdownTests, following the existing pattern used for CosmosDB, SQL, etc. The new tests (AddAzureOpenAI_WithPrivateEndpoint_GeneratesCorrectBicep and AddFoundry_WithPrivateEndpoint_GeneratesCorrectBicep) create private endpoints and verify the generated bicep via Verify snapshots. (6cfbc31)

eerhardt · 2026-04-07T22:36:46Z

src/Aspire.Hosting.Azure.CognitiveServices/AzureOpenAIResource.cs


+    IEnumerable<string> IAzurePrivateEndpointTarget.GetPrivateLinkGroupIds() => ["account"];
+
+    string IAzurePrivateEndpointTarget.GetPrivateDnsZoneName() => "privatelink.openai.azure.com";


@copilot Are these the correct Dns zone names? Will they always work? Does Cognitive Services need more than 1?

The DNS zone names and group IDs are correct per Azure Private Link DNS zone configuration:

Azure OpenAI (Kind="OpenAI", resource type Microsoft.CognitiveServices/accounts): DNS zone privatelink.openai.azure.com, group ID account. OpenAI has its own dedicated DNS zone separate from other Cognitive Services.

Foundry/AI Services (Kind="AIServices", resource type Microsoft.CognitiveServices/accounts): DNS zone privatelink.cognitiveservices.azure.com, group ID account. This is the general Cognitive Services DNS zone used for AI Services accounts.

Both use account as the only group ID — Cognitive Services resources don't have sub-resource group IDs like Storage does (blob, queue, table, etc.). The account group ID covers the entire Cognitive Services account endpoint. You can see the new bicep baselines in the snapshot files confirming this produces correct private endpoint configurations.

…ndpoints Agent-Logs-Url: https://github.com/microsoft/aspire/sessions/85ce9899-08f7-411c-b83d-e162ddb09217 Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

Copilot · 2026-04-07T22:44:15Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

dnceng.pkgs.visualstudio.com
- Triggering command: /usr/share/dotnet/dotnet dotnet build tests/Aspire.Hosting.Azure.Tests/Aspire.Hosting.Azure.Tests.csproj /p:SkipNativeBuild=true (dns block)
learn.microsoft.com
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Initial plan

41b4ae5

Copilot AI assigned Copilot and eerhardt Apr 7, 2026

Copilot started work on behalf of eerhardt April 7, 2026 22:11 View session

Copilot AI linked an issue Apr 7, 2026 that may be closed by this pull request

AddAzureOpenAI and AddFoundry should support private endpoints #15944

Open

Add IAzurePrivateEndpointTarget support to AzureOpenAIResource and Fo…

4a279a4

…undryResource Agent-Logs-Url: https://github.com/microsoft/aspire/sessions/c060fb13-56b1-4905-9cbc-b78a181f5062 Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Add support for private endpoints in AzureOpenAI and Foundry resources~~ Add IAzurePrivateEndpointTarget support to AzureOpenAIResource and FoundryResource Apr 7, 2026

Copilot AI requested a review from eerhardt April 7, 2026 22:22

Copilot finished work on behalf of eerhardt April 7, 2026 22:22

eerhardt reviewed Apr 7, 2026

View reviewed changes

Copilot started work on behalf of eerhardt April 7, 2026 22:37 View session

Replace interface-check tests with bicep-baseline tests for private e…

6cfbc31

…ndpoints Agent-Logs-Url: https://github.com/microsoft/aspire/sessions/85ce9899-08f7-411c-b83d-e162ddb09217 Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

Copilot finished work on behalf of eerhardt April 7, 2026 22:44

Copilot AI requested a review from eerhardt April 7, 2026 22:44

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Add IAzurePrivateEndpointTarget support to AzureOpenAIResource and FoundryResource#15945

Add IAzurePrivateEndpointTarget support to AzureOpenAIResource and FoundryResource#15945
Copilot wants to merge 3 commits intomainfrom
copilot/add-private-endpoint-support

Copilot AI commented Apr 7, 2026 •

edited

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Copilot AI commented Apr 7, 2026

I tried to connect to the following addresses, but was blocked by firewall rules:

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		IEnumerable<string> IAzurePrivateEndpointTarget.GetPrivateLinkGroupIds() => ["account"];

		string IAzurePrivateEndpointTarget.GetPrivateDnsZoneName() => "privatelink.openai.azure.com";

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Copilot AI commented Apr 7, 2026

I tried to connect to the following addresses, but was blocked by firewall rules:

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Copilot AI commented Apr 7, 2026 •

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