We have a small ZCM-environment with one 11.4.0-server (linux appliance) and some workstations.

Like others, I have the problem to deploy the "Post 11SP4 Update Prereq" to the server itself (System Update Deploying stucks at status "pending"), but none of the suggestions helps.
The ZCC-summary of my primary server shows, that the "Last Full Refresh" is from September 2015, the "Last Contact" from last night, the agent is green and running.

Where do I have to look, why full refresh is not working?

Thanks, Philipp