Assume we have a setup where we try to login into a website using windows integrated authentication with a custom hostname set in the hosts file. For some reason we get this error: "An Error occured during Logon, 0xC000006D" in the event log. That means that the server does call the IIS website directly through loopback!
To fix this, we need to add the FQDN to the registry in BackConnectionHostNames (multistring) under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
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IIS