Enable sylink on the client and post it here
Enable sylink debugging for Endpoint Protection clients
http://www.symantec.com/business/support/index?page=content&id=TECH104758
lets us know the result of this secars test
Testing Communication from an Endpoint Protection client to the Endpoint Protection Manager
http://www.symantec.com/business/support/index?page=content&id=TECH102682