Hi,
Thank you for posting in Symantec community,
On January 5th, 2015, Symantec Endpoint Protection version 11.0.x reached end of support life. Virus definitions and security updates are ceased to publish to LiveUpdate and general support for the product will no longer be provided.
Endpoint Protection 11.0.x clients are no longer able to download updates from Symantec LiveUpdate or an internal LiveUpdate Administrator.
- Endpoint Protection 11.0.x clients can still obtain virus definitions from a 12.1.x Endpoint Protection Manager. This is not a recommended or supported configuration, and should only be considered to maintain protection while completing the upgrade to SEP 12.1.x.
- Intrusion Prevention, Proactive Threat Protection and all other content will not be available for download through any means.
You must upgrade to the latest version of SEP.