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[Test Failure] System.Net.Security.Tests.SslStreamTlsResumeTests.DifferentHost_NoResume #132851
Description
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_NoResume fails on Windows Server 2025 (x64) for both Tls12 and Tls13. The test expects the TLS session to be resumed (expectResume: true), but resumption did not occur (Actual: False).
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)
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.Tests console log (Tls12 + Tls13 cases). 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
Report
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 0 | 28 | 111 |
Activity
dotnet-policy-service commentedon Aug 27, 2026
Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.
Remove unused client certificate from TLS host resumption test (#134422)
rzikm commentedon Sep 24, 2026
Appears to be fixed by #134422