In the CMC, go to Servers. For each "server", you'll assign a static "Request Port". The Central Management Server (CMS) has two ports - the Name Server Port, which is 6400, and the Request Port - only change the Request Port.
Each server has to be restarted after setting the port, but you cannot restart the CMS from within the CMC because it will log you off the system. So I would set all of them and then restart the Server Intelligence Agent.
-Dell