Your running symantec version too old
I am suggesting you to upgrade in 12.1 ru4 mp1a
Upgrading or migrating to Symantec Endpoint Protection 12.1.4100.4126 (RU4 MP1)
http://www.symantec.com/docs/TECH216176
System requirement detail
System Requirements for Symantec Endpoint Protection, Enterprise and Small Business Editions, and Network Access Control 12.1.4.1/12.1.4.1a
http://www.symantec.com/docs/TECH216260