Hi,
Helpful articels talking about communications protocols and ports used by SEP.
Which Communications Ports does Symantec Endpoint Protection use?
http://www.symantec.com/docs/TECH163787
Ports and Protocols to be allowed when using a proxy in a SEP environment.
http://www.symantec.com/docs/TECH131843
Which Communication Ports does Symantec Endpoint Protection 11.0 use?
http://www.symantec.com/business/support/index?page=content&id=TECH102416
Processes and Services used by Symantec Endpoint Protection
http://www.symantec.com/docs/TECH102748
I hope it's informative.