[DirectTLS] run user-callbacks on the threadpool, not on the transport event-pump threads #68647

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1. DeagleGross

   added this to the 11.0-rc2 milestone on Aug 19, 2026
2. DeagleGross

   self-assigned this

   on Aug 19, 2026
3. DeagleGross

   added the

   Feature

   issue type on Aug 19, 2026
4. DeagleGross

   added

   area-networkingIncludes servers, yarp, json patch, bedrock, websockets, http client factory, and http abstractionsIncludes servers, yarp, json patch, bedrock, websockets, http client factory, and http abstractions

   on Aug 19, 2026
5. DeagleGross

   added a parent issue on Aug 19, 2026

   • Reduce Kestrel per-connection TLS handshake overhead #65303
6. github-actions commented on Aug 19, 2026

   

   github-actionsBot

   on Aug 19, 2026 – with GitHub Actions

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   Triage Summary

   Area: area-networking (concerns Kestrel's DirectTLS transport, event-pump threads, and the TLS handshake/certificate callback path)
   Type: Feature (proposes running user callbacks off the event-pump thread onto the threadpool, rather than fixing an existing broken behavior)

   Potential Duplicates

   • ServerCertificateSelector callback needs to be async, otherwise any async work in callback may cause deadlock with threadpool (eg. logging failure to disk). #20981 - ServerCertificateSelector callback needs to be async, otherwise any async work in callback may cause deadlock with threadpool (similarity: medium — same concern about blocking/async certificate-selector callbacks, but filed against the classic Kestrel TLS adapter rather than the DirectTLS transport)
   • DirectTls transport — public API #67909 - DirectTls transport — public API (similarity: medium — same DirectTLS transport work item, related public API surface)

   Notes

   • Follows up on discussion in PR [Experimental] DirectTls transport implementation #67912 (https://github.com/dotnet/aspnetcore/pull/67912#discussion_r3755305721).

   Generated by Issue Triage Agent for dotnet/aspnetcore for #68647 · auto · 47.7 AIC · ⌖ 3.24 AIC · ⊞ 27.6K · ◷
7. DeagleGross

   closed this as completedon Aug 25, 2026