WSUS for Windows Server 2012 - Unable to download updates Event 364. Content file download failed. Reason: value does not fall within the expected range

Please make sure the hotfix kb2838998 installed:

WSUS server can't connect to Windows Update in Windows Server 2012
http://support.microsoft.com/kb/2838998

If the hotfix has been already installed
Please run the following command on you WSUS server 
and run the synchronization again:

wsusutil reset

WSUSutil.exe is located 
%drive%\Program Files\Update Services\Tools folder on your WSUS server