Hi,
SEP 11.0.6 is very old version. It was released in April'2010
You need to upgrade to the latest version.
Check here till date SEP releases:
https://www-secure.symantec.com/connect/articles/what-are-symantec-endpoint-protection-sep-versions-released-officially
Release notes:
http://www.symantec.com/business/support/index?page=content&id=TECH103087&key=54619