Who contributed to .NET on July 25, 2026?

8 developers shipped this update, including Radek Zikmund, copilot-swe-agent, jakobbotsch, steveisok, jonathanpeppers, mattleibow, morning4coffe-dev, and dotnet-maestro.

What were the notable .NET updates?

Fall back to NTLM in managed SPNEGO when Kerberos credentials are missing on Unix (#131195), Convert apphost to C, and Configuration Binder SG: ignore unresolvable metadata types to prevent ambiguous/missing-type emissions.

@dotnet

The .NET runtime, ASP.NET, and the C# tooling

github ↗

Pick a date

Topics: .NET Full archive →

The Wire · Showcase

RUNTIME FIXES KERBEROS FALLBACK ON UNIX, APPHOST CONVERTS TO C

By RepoJournal · Filed 07:00 UTC on July 25, 2026 · About .NET

8 people shipped this

copilot-swe-agent @copilot-swe-agent 2 cited

Radek Zikmund @rzikm 1 cited

jakobbotsch @jakobbotsch 1 cited

steveisok @steveisok 1 cited

jonathanpeppers @jonathanpeppers 1 cited

dotnet-maestro @dotnet-maestro 1 cited

mattleibow @mattleibow

morning4coffe-dev @morning4coffe-dev

The managed SPNEGO implementation now falls back to NTLM when Kerberos credentials go missing on Linux, closing a critical auth gap that broke enterprise deployments [ref:1].

Unix systems running the managed Negotiate handler hit a wall when KDC/TGT wasn't available: they'd error out instead of gracefully stepping down to NTLM like OpenBSD already did [1]. That's fixed. Simultaneously, the apphost binary has moved from C++ to C [2], separating entry points for apphost and dotnet while keeping the singlefilehost resolver in C++ for static linking. On the configuration front, the binder source generator now ignores unresolvable metadata types to prevent uncompilable output from transitive assembly references [3]. The JIT got a win optimizing async helpers known to always suspend, skipping unnecessary continuation checks [4]. EventSource's varargs WriteEvent path has been realigned with typed-event semantics for correct EventPipe/ETW keyword filtering [5]. Across the broader ecosystem, dotnet/android restored Java.Interop value manager tests that CoreCLR's default runtime had unconditionally removed [6], while the codeflow pipeline delivered updates from runtime, aspnetcore, fsharp, winforms, and arcade into the main dotnet repo [7].

Action items

→ Verify managed SPNEGO deployments on Linux can now reach NTLM fallback dotnet/runtime [plan]
→ Test apphost C conversion in your build pipelines before production rollout dotnet/runtime [plan]
→ Review Configuration Binder SG output if you use transitive type references dotnet/runtime [monitor]
→ Pull latest codeflow updates into your dotnet main builds dotnet/dotnet [monitor]

References

[1] Fall back to NTLM in managed SPNEGO when Kerberos credentials are missing on Unix (#131195) dotnet/runtime
[2] Convert apphost to C ↗ dotnet/runtime
[3] Configuration Binder SG: ignore unresolvable metadata types to prevent ambiguous/missing-type emissions ↗ dotnet/runtime
[4] JIT: Optimize always suspending helpers ↗ dotnet/runtime
[5] Fix EventSource WriteEvent varargs overloads dropped from EventPipe ↗ dotnet/runtime
[6] [tests] Restore Java.Interop value manager tests (#12225) dotnet/android
[7] [main] Source code updates from dotnet/runtime ↗ dotnet/dotnet

Quick answers

What shipped in .NET on July 25, 2026?: The managed SPNEGO implementation now falls back to NTLM when Kerberos credentials go missing on Linux, closing a critical auth gap that broke enterprise deployments [ref:1]. In total, 60 commits and 60 pull requests landed.
Who contributed to .NET on July 25, 2026?: 8 developers shipped this update, including Radek Zikmund, copilot-swe-agent, jakobbotsch, steveisok, jonathanpeppers, mattleibow, morning4coffe-dev, and dotnet-maestro.
What were the notable .NET updates?: Fall back to NTLM in managed SPNEGO when Kerberos credentials are missing on Unix (#131195), Convert apphost to C, and Configuration Binder SG: ignore unresolvable metadata types to prevent ambiguous/missing-type emissions.

MACIOS DOCS OVERHAUL SPANS 31 TYPES, ASPNETCORE VALIDATION MOVES TO SOURCE GENERATION

Rolf Bjarne shipped 31 types with proper XML documentation across macios while aspnetcore refactors validation classes out of the public API entirely.

dotnet 25 shipped 1-min read

@dotnet 2 days ago

SQLCLIENT KILLS PLATFORM-SPECIFIC BUILDS, ASPNETCORE HARDENS SIGNALR

SqlClient unified its Windows and Unix code paths without restructuring the NuGet package, collapsing build complexity across the entire SNI layer.

dotnet 97 shipped 2-min read

@dotnet 3 days ago

COMPLEX NUMBERS NOW IEEE 754 COMPLIANT, SKILLS EVALS GO VALLY-ONLY, UNSAFE EVOLVES

Complex<T> just shipped conformance to C23 Annex G special values, dotnet/skills completed its migration to the Vally eval harness, and the language is tightening unsafe semantics ahead of C# 13.

dotnet 141 shipped 2-min read

@dotnet 4 days ago

MAUI 11 PREVIEW 6 SHIPS WITH 190 COMMITS, MACIOS FIXES GENERATOR FLAKINESS

.NET MAUI 11.0.0-preview.6 landed with significant platform improvements while dotnet/macios tackles a critical test parallelization bug that was silently dropping thread-safety calls from generated code.

dotnet 59 shipped 2-min read

Elsewhere on the wire

AI Agents about 5 hours ago

CLAUDE OPUS 5 LANDS ACROSS THE STACK

The newest Anthropic model is now live in langchain, Cline, and llama-index, with native support for extended reasoning and 1M context windows.

ai-agents 28 shipped 1-min read

Local LLMs about 5 hours ago

OLLAMA LANDS LAGUNA SUPPORT AND CRUSHES MEMORY LEAKS WHILE SGLANG HITS V0.5.16 WITH CONFIDENCE-DRIVEN SPECULATIVE DECODING

Ollama shipped three critical performance and reliability fixes for Metal residency and concurrent access patterns, while SGL-Lang released 0.5.16 with a new speculative algorithm hitting 383.7 tok/s on DeepSeek-V4.