Hello, i have a SEPM 12.1.3001.165 on a Windows 2008R2 server. I have some Managed Clients which are Windows 2003 and they dont update their definitions automaticly. When i log on on the machines i can manuel start the Liveupdate (i have allowed manuel update) then the clients will update.

But every other client in the same group with the same rules will be updated automatic. The other clients are Windows 2008 / Windows 2008R2.

All the Windows 7 workstation updates also without any problem, i have the problem only with the Windows 2003 Servers.

So is there any problem with Windows 2003? Or did i forgot any "hidden" button?!

Are those clients not updating reporting into the SEPM? Is the green dot present on the client icon?

You can enable sylink debugging to see what's going on

How to enable Sylink debugging for the Symantec Endpoint Protection 11.x and 12.1 client in the Windows Registry

Are they 32Bit windows 2003 servers? IS SEPM downloading 32Bit defs?

On SEPM go to Admin > Servers > local site right click edit properties > Liveupdate > Platforms to Download > Change Platform are both 64Bit and 32Bit ticked? If not tick click ok and see if this resolves your issue. 

Does SEP client showing online ?

Symantec Endpoint Protection: Troubleshooting Client/Server Connectivity

Hello and thanks all for the awnsers.

@ James @ Brian the clients were online, and if i checked the Client the symbol was yellow (not up to date).

@GeoGeo, you was total right. I had forgotten to activate the X86 downloads. Thanks for you Help

 Glad to help