Endpoint Protection

i can still see the latest version of the definition on sepm homepage,everytime i tried to update,it gave msg that everything is up to date,but still with a renturn with code 4 .
SEP11.0.5002.333,windows 2008 SE with all patch
i've tried everything with no luck.
here's  a part of LOG which i think may be useful. 
----------
2010/6/3, 1:42:47 GMT -> Progress Update: DOWNLOAD_BATCH_START: Files to download: 1, Estimated total size: 0
2010/6/3, 1:42:47 GMT -> Progress Update: DOWNLOAD_FILE_START: URL: "http://liveupdate.symantecliveupdate.com/sesm$20network$20access$20control$20client$20win64_11.0.0_english_livetri.zip", Estimated Size: 0, Destination Folder: "C:\ProgramData\Symantec\LiveUpdate\Downloads"
2010/6/3, 1:42:47 GMT -> HttpSendRequest (status 404): Request failed - File does not exist on the server.
2010/6/3, 1:42:47 GMT -> Progress Update: DOWNLOAD_FILE_FINISH: - NOTE - URL: "http://liveupdate.symantecliveupdate.com/sesm$20network$20access$20control$20client$20win64_11.0.0_english_livetri.zip", Full Download Path: "C:\ProgramData\Symantec\LiveUpdate\Downloads\sesm$20network$20access$20control$20client$20win64_11.0.0_english_livetri.zip" HR: 0x802A0026
2010/6/3, 1:42:47 GMT -> HR 0x802A0026 DECODE: E_HTTP_NOT_FOUND
2010/6/3, 1:42:47 GMT -> Progress Update: DOWNLOAD_BATCH_FINISH: HR: 0x0       , Num Successful: 0

its not downloading defs; the homepage connectes to internet and gives the .latest available info
try this document

http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2007121710290448

 
  Steps to resolev     "Error: LiveUpdate encountered one or more errors. Return code = 4" in LiveUpdate status in Symantec Endpoint Protection Manager

---->Check for proxy in the network, if there  is a proxy then enter the proxy settings for LU
---->  Check to see if Enhanced Security is  enabled or not in Internet Explorer.If yes then Disable it
---->Uninstalle LiveUpdate
---->Delete C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate Liveupdate folder
---->Reinstall LiveUpdate
---->Registere Liveupdate to SEPM

Opene the  command prompt browsed  to:
C:\Program Files\Symantec\Symantec Endpoint Protection Manager\bin
lucatalog –cleanup
lucatalog –update

---->Run Liveupdate from SEPM

check for proxy setting whether any password or download limit problem.

Although I didn't get error 4, I had a problem with the SEPM's liveupdate not downloading AV defs (downloaded everything else) and that was because I had a 3rd party zip program (WinRar) installed; that seemed to break the handling of the zip files within LU somehow - do you have a similar program installed?

Also, on the SEPM home page, in the definitions distribution window it will show you the latest definition version on Symantec's server and the latest definition version on your manager; I assume these are a few days apart?

thx a lot.
i did try for some days,it seems something wrong with the network of my company,for i tested liveupdate at home,it worked very well.

i did nothing but tje network suddently worked well with LU yesterday.........