After you install SP1 on Windows 2008 R2 SP1, you may encounter problems with RDP after reboot. This happens if http://support.microsoft.com/kb/2667402 is already installed.
Fix: Uninstall http://support.microsoft.com/kb/2667402 before installing SP1J
If you already have installed SP1 with KB2667402 already installed you must uninstall KB2667402 and then re-apply it. You can uninstall it remotely with following command:
wmic /node:<SERVER> process call create “powershell wusa /uninstall /kb:2667402 /quiet /forcerestart”