You will get a 401.1 error when trying to access the fully qualified domain name (FQDN) of your SharePoint site from the server. This is due to the loopback security check found in Windows Server 2003 SP1 or later, as well as Windows Server 2008 and Windows Server 2008 R2. To fix this you need to add a registry key to disable the loopback check. You could do this via the Registry Editor, but where is the fun in that?! Pop open a PowerShell console and enter the following:
New-ItemProperty HKLM:\System\CurrentControlSet\Control\Lsa -Name "DisableLoopbackCheck" -Value "1" -PropertyType dword
Make sure to reboot your server afterwards. Then, try your SharePoint site again and you should be good to go!
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