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httpsasp.net-core-2.1ntlm.net-4.8httpsys

NTLM is not working with Http.sys of ASP.NET Core 2.1 on .NET48 with https and wildcard certificate when accessing from same machine

So the NTLM authentication does not work with Http.sys of ASP.NET Core 2.1 on .NET48 with https when accessed from the browser on the same machine the server is running on. Nevertheless it works when accessed from any other machine.

Screenshot of network requests: enter image description here

The wildcard certificate is issued for example to *.mycompany.com and the url used for hosting with Http.sys is https://server01.mycompany.com:443/app.

However username/password does work in all settings.

Has anyone encountered the same problem? Or does have a solution to this problem?

Edit: Typos, screenshot added.

Edit 2: I have created an issue at Github.

Solution

  • The problem is the "full computer name", which can be seen in Control Panel\System and Security\System. Instead of server01.mycompany.com it was actually server01.graz.mycompany.com and the url didn't match that. Also a new TLS wildcard certificate for *.graz.mycompany.com is necessary.