pass on the liveupdate log ..
Edit..
Hello,
I believe you are running the SEP 12.1 on your machine.
Could let us know what OS are you running on this server?
Could you please provide us the full SEPM 12.1 version and SEP 12.1 client version?
Is the SEP client installed on the server an Unmanaged Client?
Are you using any proxy ?
Check this Article:
Symantec Endpoint Protection: LiveUpdate Troubleshooting Flowchart
http://www.symantec.com/docs/TECH95790
Please answer the above question and please upload the log.liveupdate and Log.Lue from the server machine which would provide us the root cause of the issue.
More detailed information about why LiveUpdate failed can be found in the following log file:
These are found under:
C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate\Log.LiveUpdate
C:\Documents and Settings\All Users\Application Data\Symantec\Symantec Endpoint Protection\12.1.671.4971.105\Data\Lue\Logs
On Windows Vista, Windows 7, and Windows Server 2008:
C:\Program Data\Symantec\Symantec Endpoint Protection\<silo_id>\Data\Lue\Logs