Error: "Can't communicate with the Server Group..."

Question/Issue:
When you unlock a server group in the Symantec System Center, you see the following error message: "Error: Can't communicate with the Server Group. Verify Network Connectivity and that machines are operating within the Group! If problem persists, try clearing the Server Group cache and re-discovering all Server Groups."

Refer URL:

http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2005051209365248?OpenDocument&src=ent_hot&dtype=corp&prod=Symantec%20AntiVirus%20Corporate%20Edition&ver=10.0&tpre=

Document ID: 2005051209365248