Test failure: System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert(protocol: Tls12)

[JulieLeeMSFT]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1523549
Build error leg or test failing: System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert(protocol: Tls12)

    System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert(protocol: Tls12) [FAIL]
      Assert.Throws() Failure: No exception was thrown
      Expected: typeof(System.Security.Authentication.AuthenticationException)
      Stack Trace:
        /_/src/libraries/System.Net.Security/tests/FunctionalTests/TlsSessionTests.cs(452,0): at System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert(SslProtocols protocol)

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert(protocol: Tls12) [FAIL]",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1523549
Error message validated: [System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert(protocol: Tls12) [FAIL]]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/24/2026 4:43:24 PM UTC

Report

Build	Repository	Test	Pull Request
1528737	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131383
1528280	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131423
1528141	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131265
1528135	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131402
1527933	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#129690
1527259	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131375
1527229	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert
1527206	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131374
1527016	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert
1526990	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#121367
1526702	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131345
1526583	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert
1526412	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert
1526384	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert
1526284	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131351
1525890	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#131348
1525493	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert	#129690
1523549	dotnet/runtime	System.Net.Security.Tests.TlsSessionTests.SslStreamServer_RejectsClientCert_ClientObservesAlert

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
5	18	18

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.

[JulieLeeMSFT]

@dotnet/ncl, PTAL. It is failing consistently in runtime and outerloops.