Hello
Look this artical hope it help you.
Symantec Endpoint Protection 11.x: How to Change the ports used for communication between the Manager and clients
http://www.symantec.com/docs/TECH106489
whats the version of SEP you are using, if you are using 11.X above document explains it very well.
if its 12 check this document
http://www.symantec.com/business/support/index?page=content&id=TECH163215
Have a look here as well:
https://www-secure.symantec.com/connect/forums/changing-communication-port-sep
Hi,
Check this thread may be help you.
https://www-secure.symantec.com/connect/forums/can-i-change-ports-sep-11