Did you know about the SEP diagnostic tool?
This tool helps you to pinpoint issues with SEP. It works with Endpoint protection, Endpoint protection small business edition and network access control.
Below is the description and where you can find it on the Symantec support site.
The Symantec Endpoint Protection Support Tool is a utility designed to quickly and efficiently diagnose common issues encountered with Endpoint Protection and the Endpoint Protection Manager. With this release, the utility is limited to diagnosing problems on the local computer (that is, the computer that is running the utility). If a problem is identified, the tool will direct you to a solution, or the information can be provided to Tech Support, who can guide you through the next steps.
You can download the utility here: http://service1.symantec.com/SUPPORT/ent-security....