Do you still have Symantec Endpoint Protection 11 in your environment?
On January 5th, 2015, Symantec Endpoint Protection 11.0.x and Symantec Endpoint Protection Small Business Edition 12.0 will reach End-of-Support-Life and no longer be entitled to support, LiveUpdate, virus definitions and security updates. To remain protected, ensure all of your endpoints have been migrated to version 12.1 and activate the advanced protection available through Insight reputation scoring and SONAR behavioral monitoring. Endpoints that continue to run Endpoint Protection 11.x and SBE 12.0 after End-of-Support Life (EOSL) will no longer receive virus definitions, content updates, break fixes, patches, workarounds or technical support.
For more details, check this BLOG!