[Android] IPv6 / dual-mode socket tests fail on Ubuntu.2204.Amd64.Android.29.Open emulator queue

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Several System.Net.Sockets tests fail on the Ubuntu.2204.Amd64.Android.29.Open Helix queue with SocketException: Connection refused when binding/connecting on ::1 or via IPv4-mapped IPv6 dual-mode sockets (::ffff:<ip>). This is an infrastructure issue in the API 29 Android emulator; the runtime code is correct and the same tests pass on every other platform. Runtime-side [ActiveIssue] skips must be removed once the infra is fixed.

Tracking issues / PRs:

• [ci-scan] Known Build Error: System.Net.Sockets DualMode IPv6 tests fail on Android with Connection refused #127986
• [ci-scan] Test failure: SocketAsyncEventArgsTest.Connect_Parallel_FailsOver on android #127954
• Assertion failure in ConnectAsync_WithBuffer_Succeeds on Android/MacCatalyst/tvOS (Mono/CoreCLR/NativeAOT) #125825
• Android socket tests failing with IPv6 connectivity issues #127422
• [ci-scan] Skip Android DualMode IPv6 socket tests (Connection refused on ::1) #127994 (merged skip)
• [mobile] Fix SocketBlockingModeTransitionTests on Android #127140 (merged)
• [ci-scan] Skip System.Net.Sockets IPv6 tests on Android (refs #127565) #127964 (open skip)

/cc: @rzikm @liveans

The disabled tests will be reverted once the helix enables ip v6 on android.

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Build 1403076 occurrence (2026-04-30)

The System.Net.Sockets dual-mode IPv6 test failures are still present in build 1403076 (android-arm Release AllSubsets_Mono).

Affected work item: System.Net.Sockets.Tests
Helix job: a15256d6-6fd8-48b0-bad8-c8709dc9e6a7
Exit code: 1 (test failures)

Failing tests (5 total):

• DualModeConnectToDnsEndPoint.DualModeConnect_DnsEndPointToHost_Helper(listenOn: ::1, dualModeServer: False)
• SocketAsyncEventArgsTest.Connect_Parallel_FailsOver(preferIPv6: True)
• DualModeConnectAsync.DualModeConnectAsync_DnsEndPointToHost_Helper(listenOn: ::1, dualModeServer: False)
• DualModeConnectToHostString.DualModeConnect_LoopbackDnsToHost_Helper(listenOn: ::1, dualModeServer: False)
• SocketBlockingModeTransitionTests.ConnectAsync_WithBuffer_Succeeds

Generated by Mobile Platform Failure Scanner · ● 3.1M · ◷