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Showing content from https://github.com/aspnet/Announcements/issues/422 below:

HttpSys client certificate renegotiation disabled by default · Issue #422 · aspnet/Announcements · GitHub

The option to renegotiate a connection and request a client certificate has been disabled by default.

See dotnet/aspnetcore#23181 for discussion.

Version introduced

5.0

Old behavior

The connection could be renegotiated to request a client certificate.

New behavior

Client certificates can only be requested during the initial connection handshake. See dotnet/aspnetcore#23162.

Reason for change

Renegotiation caused a number of performance and deadlock issues. It's also not supported in HTTP/2. See dotnet/aspnetcore#14806 for when the option to control this behavior was first introduced in 3.1.

Recommended action

Applications that require client certificates should use netsh.exe to set the clientcertnegotiation option to enabled. See https://docs.microsoft.com/en-us/windows-server/networking/technologies/netsh/netsh-http

If you only want client certificates enabled for some parts of your application then see the guidance at https://docs.microsoft.com/en-us/aspnet/core/security/authentication/certauth?view=aspnetcore-3.1#optional-client-certificates.

If you need the old renegotiate behavior then set HttpSysOptions.ClientCertificateMethod to the old value ClientCertificateMethod.AllowRenegotiate. This is not recommended for the reasons outlined above and in the linked guidance.