Microsoft has just updated the following KB Article: Mobile Device Management installation errors on System Center 2012 Configuration Manager SP1 Management Point Symptoms When you attempt to enable a mobile device on a management point enabled for mobile devices in System Center 2012 Configuration Manager Service Pack 1, you may see the following error in the mpcontrol.log:
Call to HttpSendRequestSync failed for port 443 with status code 401, text: Unauthorized
http://support.microsoft.com/kb/2814125 I’ve updated the list of KB Articles for ConfigMgr 2012 accordingly.