PRB: You receive ‘not authorized’ errors on the TFS AT itself

The Problem

On the TFS application, if you try to access TFS using its FQDN you receive a “Not authorized” or “Unauthorized” error.

Unauthorized error message on the TFS drives you crazy?

How to fix

Try disabling the authentication loopback check as described in KB 887993 (there are two methods, where setting BackConnectionHostNames is the preferred one).

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