Hello,
What version of SEP 11 are you running??
When you say "Daily Patches", I believe you are talking about daily definitions, isn't it?
Here are few Documents, which you can work on:
Symantec Endpoint Protection: LiveUpdate Troubleshooting Flowchart
http://www.symantec.com/docs/TECH95790
Symantec Endpoint Protection: Troubleshooting Client/Server Connectivity
http://www.symantec.com/docs/TECH105894
Hope that helps!!