Hello,
Best Practices: Configuring a Symantec Endpoint Protection environment in a DMZ
http://www.symantec.com/business/support/index?page=content&id=TECH178325&profileURL=https%3A%2F%2Fsymaccount-profile.symantec.com%2FSSO%2Findex.jsp%3FssoID%3D13949764509257qSSuWRH8A1vUUTwBdwjWdF5QW3B098Bmy3et
https://www-secure.symantec.com/connect/forums/what-ports-needs-openning-dmz-servers-be-managed
https://www-secure.symantec.com/connect/forums/firewall-ports-push-deployment
Communication issues with SEP client installed in DMZ while the SEP Manager is outside DMZ
Security recommendations regarding SEP client installed on server located in DMZ