SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved test failures

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1577009
Build error leg or test failing: System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved
Pull request: https://github.com/dotnet/runtime/pull/132747

```
System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved [FAIL]
System.Net.Http.HttpRequestException : The request was aborted.
Stack Trace:
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/Http3Connection.cs(318,0): at System.Net.Http.Http3Connection.SendAsync(HttpRequestMessage request, WaitForHttp3ConnectionActivity waitForConnectionActivity, Boolean streamAvailable, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/Http3Connection.cs(355,0): at System.Net.Http.Http3Connection.SendAsync(HttpRequestMessage request, WaitForHttp3ConnectionActivity waitForConnectionActivity, Boolean streamAvailable, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectionPool/HttpConnectionPool.Http3.cs(108,0): at System.Net.Http.HttpConnectionPool.TrySendUsingHttp3Async(HttpRequestMessage request, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectionPool/HttpConnectionPool.cs(441,0): at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnectionPoolManager.cs(450,0): at System.Net.Http.HttpConnectionPoolManager.SendAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpMessageHandlerStage.cs(21,0): at System.Net.Http.HttpMessageHandlerStage.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/Metrics/MetricsHandler.cs(160,0): at System.Net.Http.Metrics.MetricsHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpMessageHandlerStage.cs(21,0): at System.Net.Http.HttpMessageHandlerStage.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/DiagnosticsHandler.cs(78,0): at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/RedirectHandler.cs(87,0): at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpMessageHandlerStage.cs(21,0): at System.Net.Http.HttpMessageHandlerStage.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.cs(139,0): at System.Net.Http.Functional.Tests.VersionHttpClientHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
/_/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs(538,0): at System.Net.Http.HttpClient.g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
/_/src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Cookies.cs(492,0): at System.Net.Http.Functional.Tests.HttpClientHandlerTest_Cookies.<>c__DisplayClass23_0.b__0(Uri serverUrl)
/_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(119,0): at System.Threading.Tasks.TaskTimeoutExtensions.GetRealException(Task task)
--- End of stack trace from previous location ---
/_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(89,0): at System.Threading.Tasks.TaskTimeoutExtensions.WhenAllOrAnyFailed(Task[] tasks)
/_/src/libraries/Common/tests/System/Net/Http/GenericLoopbackServer.cs(44,0): at System.Net.Test.Common.LoopbackServerFactory.<>c__DisplayClass6_0.b__0(GenericLoopbackServer server, Uri uri)
/_/src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeAsyncTaskContinuation.cs(131,0): at System.Runtime.CompilerServices.RuntimeAsyncTaskContinuation.GetResult(Task task, Byte& result)
/_/src/libraries/Common/tests/System/Net/Http/Http3LoopbackServer.cs(114,0): at System.Net.Test.Common.Http3LoopbackServerFactory.CreateServerAsync(Func`3 funcAsync, Int32 millisecondsTimeout, GenericLoopbackOptions options)
/_/src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeAsyncTaskContinuation.cs(131,0): at System.Runtime.CompilerServices.RuntimeAsyncTaskContinuation.GetResult(Task task, Byte& result)
/_/src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Cookies.cs(483,0): at System.Net.Http.Functional.Tests.HttpClientHandlerTest_Cookies.GetAsync_Redirect_CookiesArePreserved()
```

## Error Message

**DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK** otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": "SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577009
**Error message validated:** `[SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 9/2/2026 4:45:27 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1595554](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595554)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595554&view=ms.vss-test-web.build-test-results-tab&runId=44053136&resultId=229576)|dotnet/runtime#131597|
|[1595348](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595348)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595348&view=ms.vss-test-web.build-test-results-tab&runId=44048706&resultId=211125)|dotnet/runtime#129683|
|[1594919](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594919)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594919&view=ms.vss-test-web.build-test-results-tab&runId=44030730&resultId=227705)||
|[1594486](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594486)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594486&view=ms.vss-test-web.build-test-results-tab&runId=44015032&resultId=216136)||
|[1593908](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593908)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593908&view=ms.vss-test-web.build-test-results-tab&runId=43995394&resultId=230625)|dotnet/runtime#133774|
|[1593777](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593777)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593777&view=ms.vss-test-web.build-test-results-tab&runId=43991256&resultId=228941)|dotnet/runtime#133763|
|[1593635](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593635)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593635&view=ms.vss-test-web.build-test-results-tab&runId=43988338&resultId=218056)|dotnet/runtime#133748|
|[1590908](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590908)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590908&view=ms.vss-test-web.build-test-results-tab&runId=43916670&resultId=215988)|dotnet/runtime#132456|
|[1589510](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589510)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589510&view=ms.vss-test-web.build-test-results-tab&runId=43874880&resultId=174876)||
|[1589165](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589165)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589165&view=ms.vss-test-web.build-test-results-tab&runId=43866458&resultId=214415)|dotnet/runtime#132953|
|[1589092](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589092)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589092&view=ms.vss-test-web.build-test-results-tab&runId=43863702&resultId=229104)|dotnet/runtime#133501|
|[1588512](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588512)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588512&view=ms.vss-test-web.build-test-results-tab&runId=43844168&resultId=177197)|dotnet/runtime#133472|
|[1588450](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588450)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588450&view=ms.vss-test-web.build-test-results-tab&runId=43841600&resultId=237348)|dotnet/runtime#133450|
|[1588425](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588425)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588425&view=ms.vss-test-web.build-test-results-tab&runId=43840568&resultId=231699)||
|[1588064](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588064)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588064&view=ms.vss-test-web.build-test-results-tab&runId=43828836&resultId=214076)|dotnet/runtime#131869|
|[1586454](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1586454)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1586454&view=ms.vss-test-web.build-test-results-tab&runId=43777010&resultId=229371)|dotnet/runtime#133381|
|[1584461](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584461)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584461&view=ms.vss-test-web.build-test-results-tab&runId=43717126&resultId=214623)|dotnet/runtime#133308|
|[1584429](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584429)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584429&view=ms.vss-test-web.build-test-results-tab&runId=43716086&resultId=215586)|dotnet/runtime#133265|
|[1583242](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1583242)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1583242&view=ms.vss-test-web.build-test-results-tab&runId=43681488&resultId=205753)|dotnet/runtime#133239|
|[1582118](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582118)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582118&view=ms.vss-test-web.build-test-results-tab&runId=43646736&resultId=215082)||
|[1581157](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1581157)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1581157&view=ms.vss-test-web.build-test-results-tab&runId=43621808&resultId=216306)|dotnet/runtime#133099|
|[1580798](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580798)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580798&view=ms.vss-test-web.build-test-results-tab&runId=43609260&resultId=194591)||
|[1580719](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580719)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580719&view=ms.vss-test-web.build-test-results-tab&runId=43607186&resultId=210766)|dotnet/runtime#133028|
|[1579332](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1579332)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1579332&view=ms.vss-test-web.build-test-results-tab&runId=43554462&resultId=194851)|dotnet/runtime#133082|
|[1577009](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577009)|dotnet/runtime|[System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_Cookies_Http3.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577009&view=ms.vss-test-web.build-test-results-tab&runId=43477894&resultId=212739)|dotnet/runtime#132747|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|15|25|