Client Agent Certificate Problem – Hotfix KB2801987
Attention: Downloads of SCCM 2012 SP1 done after 29. of January 2013 do not need this hotfix, it is already included in the source!
The Hotfix KB2801987 is available (http://support.microsoft.com/kb/2801987/en-us) and solves the problem with the client installation on SCCM 2012 SP1 – see article here!