System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResume(sslProtocol: Tls12) [FAIL]
Assert.Equal() Failure: Values differ
Expected: True
Actual: False
Stack Trace:
/_/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamAllowTlsResumeTests.cs(256,0): at System.Net.Security.Tests.SslStreamTlsResumeTests.RunConnectionAsync(SslServerAuthenticationOptions serverOptions, SslClientAuthenticationOptions clientOptions, Nullable`1 expectResume)
/_/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamAllowTlsResumeTests.cs(401,0): at System.Net.Security.Tests.SslStreamTlsResumeTests.TestNoResumeAfterChange(SslServerAuthenticationOptions serverOptions, SslClientAuthenticationOptions clientOptions, Action`2[] updateOptions)
--- End of stack trace from previous location ---
System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResume(sslProtocol: Tls13) [FAIL]
Assert.Equal() Failure: Values differ
Expected: True
Actual: False
Stack Trace:
(identical to the Tls12 case above)
{
"ErrorMessage": [
"System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResume",
"Assert.Equal() Failure: Values differ",
"Expected: True",
"Actual: False"
],
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569288
Build error leg or test failing: windows-x64 Debug CoreCLR_AllSubsets (windows.server2025.amd64.open.rt) - System.Net.Security.Tests
Pull request: #132794
KBE authoring guidance
Error Detailsis for readers. Build Analysis parses only the single JSON block underError Message.ErrorMessageis in array form: each element is matched as a case-sensitive ordinalString.Containssubstring, in order, copied verbatim from the failing log.BuildRetryisfalse(deterministic assertion failure, not an infrastructure flake).ExcludeConsoleLogisfalse.Error Details
System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResumefails on Windows Server 2025 (x64) for bothTls12andTls13. The test expects the TLS session to be resumed (expectResume: true), but resumption did not occur (Actual: False).Error Message
{ "ErrorMessage": [ "System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResume", "Assert.Equal() Failure: Values differ", "Expected: True", "Actual: False" ], "ErrorPattern": "", "BuildRetry": false, "ExcludeConsoleLog": false }KBE verification
Filed manually via the create-kbe skill (not the scheduled ci-failure-scan).
Artifact kind: kbe-verification
Verified match count: 2 hits per array element in the failing
System.Net.Security.Testsconsole log (Tls12+Tls13cases). The test name appears only on[FAIL]lines, with no[PASS]/[SKIP]matches.Failing build finished: 2026-08-27T17:29:35Z (after the console log was produced).
Note
This issue was created with the assistance of GitHub Copilot.
Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569288
Error message validated:
[System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResume Assert.Equal() Failure: Values differ Expected: True Actual: False]Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/27/2026 7:27:41 PM UTC
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Summary