Hi,

a Customer calls me that his Windows Clients won’t install some Updates and the boxes does not submit their update states to the WSUS Server which runs at Windows Update Server 3 SP2.

At the clients I checked the Windows Update Logfile C:\Windows\WindowsUpdate.log and found many errors like these:

2014-09-25    23:17:37:280     732    9b4    Misc    WARNING: Digital Signatures on file C:\Windows\SoftwareDistribution\SelfUpdate\wuident.cab are not trusted: Error 0x800b0001

It means that the the Clients does no longer trust the WSUS Server due to an invalid signature of the WSUS Client update package.

Microsoft has released the hotfix KB2734608 for this issue. I installed this fix on the WSUS Server and restart the it.

At the clients stop the “Windows Update” Service
net stop wuauserv
Delete the SoftwareDistibution Folder
rmdir /s /q %windir%\softwaredistribution\
Start the service
net start wuauserv
and reset the “Windows Update” service by executing.
wuauclt /resetauthorization /detectnow

After a few minutes the client provides new updates.

Michael