Hi,
Could you please provide following details:
Issue is occuring on SEPM machine or at SEP client?
SEPM & SEP client version?
Liveupdate error code 4 is very commonly seen if liveupdate is failing.
Can you pass on log.liveupdate file?
Also check these articles:
"Error: LiveUpdate encountered one or more errors. Return code = 4" in LiveUpdate status in Symantec Endpoint Protection Manager
http://www.symantec.com/docs/TECH103112
Configuring Symantec Endpoint Protection Manager to connect to a proxy server to access the Internet
http://www.symantec.com/docs/HOWTO55201
You can try to reinstall liveupdate.
Liveupdate setup.
ftp://ftp.symantec.com/public/english_us_canada/liveupdate/3.3.0/