HTTP Error 401.0 - Unauthorized (occured on Windows Server 2008 R2)

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HTTP Error 401.0 - Unauthorized (occured on Windows Server 2008 R2)

Error in browser:

HTTP Error 401.0 - Unauthorized

Possible reason 1:

The 'Forms Authentication' is not activated in the 'Windows Features' for the web site (similar to error code 401.2).

Solution:

Activate the 'Forms Authentication' in the 'Windows Features' and for the web site via the IIS-Manager. You can find the steps here: HTTP Error 401.2 (occurred on Windows Server 2012)