Hello,
What version of SEP is installed?
Please check if you have the latest version of SEP. The Latest version is 11.0.6300
You can download it from https://fileconnect.symantec.com using your serial number.
We recommend you to upgrade the Symantec Endpoint Protection Manager and all clients to Latest version.
If you are carrying old version than 11.0.6005, there would be 2 upgrades you will have to go through. Please check the steps below:
1) From Symantec Endpoint Protection older version to Symantec Endpoint Protection 11.0.6005 (RU6a)
http://www.symantec.com/business/support/index?page=content&id=TECH131653
2) From Symantec Endpoint Protection 11.0.6005 (RU6a) to Symantec Endpoint Protection 11.0.6300 (RU6 MP3)
http://www.symantec.com/business/support/index?page=content&id=TECH155655
Reason:---> check the Release Notes below:
Release notes for Symantec Endpoint Protection 11.0.x and Symantec Network Access Control 11.0.x