WUS: How to Update "Automatic Updates" on Windows Server 2003

Hi there

i have a beta WUS Server running. it really works fine. I have only
problem left.

i have some Windows 2003 Servers, 2 of them get their Updates from WUS
with no trouble. The other Windows 2003 Server do not communicate
correctly so they do not get updates. I suppose the problem has to do
with the wrong version of the wuaueng.dll/wuauclt.exe.

the non-working servers have version 5.4.3790.0 the others have a
newer version.

now:

1. i don't know how to update the wuaueng.dll correctly on the
non-working servers
2. i can't remember if i did anything to update the working ones in
the past...

does someone have a hint?

thanks in advance