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HttpClient not sending certificate setup in handler

area-System.Security

needs-further-triageIssue has been initially triaged, but needs deeper consideration or reconsiderationIssue has been initially triaged, but needs deeper consideration or reconsideration

regression-from-last-release

Status: Open.

#109050 In dotnet/runtime;

· eeaquino opened on Oct 19, 2024

WASM AOT fails with regex in .NET 9

arch-wasmWebAssembly architectureWebAssembly architecture

area-Codegen-AOT-mono

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#109862 In dotnet/runtime;

· voroninp opened on Nov 15, 2024

Loading PFX without admin causes CryptographicException

area-System.Security

regression-from-last-release

Status: Open.

#110217 In dotnet/runtime;

· timmac-qmc opened on Nov 27, 2024

.NET 9.0.1 Breaking Change in macOS native library resolution

area-Interop-coreclr

regression-from-last-release

Status: Open.

#112080 In dotnet/runtime;

· yaakov-h opened on Feb 3, 2025

Stock Blazor standalone app with AOT compilation enabled fails to load in up-to-date Chrome when the host OS is Linux

arch-wasmWebAssembly architectureWebAssembly architecture

area-VM-meta-mono

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#110056 In dotnet/runtime;

· kmk-irc opened on Nov 21, 2024

Blazor WASM produces larger binaries with dotnet 9 compared to dotnet 8, even with WasmStripILAfterAOT=true

arch-wasmWebAssembly architectureWebAssembly architecture

area-Codegen-AOT-mono

Status: Open.

#110143 In dotnet/runtime;

· iSeiryu opened on Nov 25, 2024

regression net9.0 ServicePoint throws PNSE on browser

area-System.Net

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

regression-from-last-release

Status: Open.

#113174 In dotnet/runtime;

· lewing opened on Mar 5, 2025

MONO_WASM: jit_call code generation failed in Blazor WASM project

arch-wasmWebAssembly architectureWebAssembly architecture

area-Codegen-Interpreter-mono

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#113657 In dotnet/runtime;

· Dona278 opened on Mar 18, 2025

[Android] App crashing with condition `xref_count == xref_index' not met

area-GC-mono

in-prThere is an active PR which will close this issue when it is mergedThere is an active PR which will close this issue when it is merged

Status: Open.

#106410 In dotnet/runtime;

· kklose23 opened on Aug 14, 2024

[net9] System.Private.CoreLib occurs InvalidOperationException and InvalidCastException

area-System.Threading

regression-from-last-release

runtime-monospecific to the Mono runtimespecific to the Mono runtime

Status: Open.

#114262 In dotnet/runtime;

· sleushunou opened on Apr 4, 2025

[release/9.0][mobile] Overview of mobile related CI failures

area-Infrastructure-mono

os-android

os-iosApple iOSApple iOS

os-maccatalystMacCatalyst OSMacCatalyst OS

os-tvosApple tvOSApple tvOS

trackingThis issue is tracking the completion of other related issues.This issue is tracking the completion of other related issues.

Status: Open.

#115003 In dotnet/runtime;

· matouskozak opened on Apr 24, 2025

Documenting .NET 9 APIs

area-Meta

documentationDocumentation bug or enhancement, does not impact product or test codeDocumentation bug or enhancement, does not impact product or test code

Status: Open.

#105974 In dotnet/runtime;

· carlossanlop opened on Aug 5, 2024

Regression in .NET 9-RC2: Case-insensitive handling of JsonNode

area-System.Collections

breaking-changeIssue or PR that represents a breaking API or functional change over a previous release.Issue or PR that represents a breaking API or functional change over a previous release.

needs-breaking-change-doc-createdBreaking changes need an issue opened with https://github.com/dotnet/docs/issues/new?template=dotnetBreaking changes need an issue opened with https://github.com/dotnet/docs/issues/new?template=dotnet

Status: Open.

#108790 In dotnet/runtime;

· bart-vmware opened on Oct 11, 2024

Test failure: System.Transactions.Tests.TransactionManagerTest.DefaultTimeout_MaxTimeout_Set_Get

area-System.Transactions

blocking-clean-ci-optionalBlocking optional rolling runsBlocking optional rolling runs

bug

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

os-windows

Status: Open.

#105124 In dotnet/runtime;

· v-wenyuxu opened on Jul 19, 2024

License metadata on windows runtime nuget packages is wrong

area-Meta

blocking-release

Status: Open.

#108905 In dotnet/runtime;

· js6pak opened on Oct 15, 2024

JsonSerializer.Deserialize failing for some types in net9.0 that worked in net8.0.

area-System.Text.Json

bug

regression-from-last-release

Status: Open.

#113268 In dotnet/runtime;

· chuckries opened on Mar 7, 2025

[Release Mode] Conditional check against byte.MaxValue unexpectedly ignored in .NET 9

area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMICLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

Status: Open.

#118317 In dotnet/runtime;

· TheRangerr opened on Aug 3, 2025

Consider backport (or not) FileSystemEnumerator fixes for Unix

area-System.IO

Status: Open.

#117250 In dotnet/runtime;

· jozkee opened on Jul 2, 2025

Backport "stop testing with nodejs" to net9

arch-wasmWebAssembly architectureWebAssembly architecture

area-VM-meta-mono

Status: Open.

#119092 In dotnet/runtime;

· ilonatommy opened on Aug 26, 2025

<code>dotnetbuilds.blob.core.windows.net</code> has no anonymous access -- switch to new CDN

arch-wasmWebAssembly architectureWebAssembly architecture

area-Build-mono

Status: Open.

#122244 In dotnet/runtime;

· richlander opened on Dec 5, 2025

[release/9.0-staging] Add fetchTags: false to all checkout steps in CI pipelines

Status: Open (in progress).

dotnet/runtimenumber 122402

#122402 In dotnet/runtime;

· Copilot opened on Dec 10, 2025