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Citado a partir do KB;
Click Start, click Run, type cmd in the Open box, and then click OK.
At the command prompt, type net stop wuauserv, and then press ENTER.
Click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate
In the details pane of Registry Editor, delete the following registry entries:
PingID
AccountDomainSid
SusClientId
SusClientIDValidation
Note Windows Update Agent 3.0 adds the SusClientIDValidation value. This value was released in May 2007. The other registry entries
exist in both Windows Update Agent 2.0 and in Windows Update Agent
3.0.
Exit Registry Editor.
At the command prompt, type net start wuauserv, and then press ENTER.
At the command prompt, type wuauclt.exe /resetauthorization /detectnow, and then press ENTER.
Wait 10 minutes for a detection cycle to finish.
Start the WSUS console to make sure that the clients appear in the WSUS console.