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carey | 4 years ago

At least when it was released, IIS 10 supported HTTP/2, but did not support Kerberos, Negotiate or NTLM authentication over HTTP/2.

https://docs.microsoft.com/en-us/iis/get-started/whats-new-i...

I’m not sure that it’s a problem with HTTP/2 that Microsoft found no reason to implement Windows authentication for it.

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jiggawatts|4 years ago

The HTTP/2 protocol specifically makes this kind of authentication difficult. It's not just IIS, in general it doesn't quite work right.