If you are running Service Pack 2 for Windows XP, you should run version 9.x of Symantec AntiVirus and you will need to open the following port to enable Symantec AntiVirus Corporate Edition client/server communications to work efficiently:
The Windows Security Center feature of Service Pack 2 reports compatibility differently for different versions of Symantec AntiVirus. For more information on this and other related issues, see Symantec's information center on the subject.
If you are operating behind a firewall, you will need to open the following ports to enable Symantec AntiVirus Corporate Edition client/server communications and LiveUpdate to work correctly: