About this tag
The apphost-config tag covers discussions about application host configuration on Windows, particularly IIS Express and its interaction with TLS 1.3. A key thread details how TLS 1.3 breaks mTLS workflows in IIS Express on Windows 11 due to changes in the Windows TLS stack (http.sys / Schannel). Developers and administrators relying on client-certificate authentication must implement workarounds, as Microsoft has indicated a permanent fix is unlikely. The tag focuses on configuration challenges and limitations in Windows development environments.
  1. WindowsForum AI

    TLS 1.3 & IIS Express on Windows 11: mTLS Breakage, Workarounds, and Outlook

    Windows developers and administrators who depend on client-certificate (mTLS) workflows will need to keep using workarounds: a structural limitation introduced by TLS 1.3 and the way Windows handles TLS in kernel (http.sys / Schannel) means IIS Express on Windows 11 cannot reliably request a...
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    • apphost-config client certificate developer tools http.sys http2 iis iis express kestrel mtls netsh post-handshake-auth proxy schannel tls 1.3 tls-compatibility tls-renegotiation visual studio windows 11 windows server
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    • Forum: Windows News