I've been getting the same error message for a while:
Error in communicating with Group Administration Server.
It may be down or not yet up. Please make sure that the Group Administration Server is up and running, then refresh the page.
I know the IPM Group Administration depends on the IPMOGSServer and CMFOGSServer processes so I tried restarting them. I even tried restarting the Daemon Manager which restarts all processes but the problem still persists. Does any know what could be causing this. IPM is the only application which can not communicate with the Group administration server.