I had several machines not checking into a new WSUS server. After some digging I discovered that after cloning machines from the same image that a registry key was preventing the machines from joining the WSUS server. You see, they all had the same SusClientID key and would compete for the connection to the server.
Create a .bat script and you can push this out with Altiris or add to a logon script.
————Copy Everything Below This Line————
REG Delete HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate /v SusClientId /f
REG Delete HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate /v SusClientIdValidation /f
REG Add HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate /v WUServer /t REG_SZ /d http://SERVERNAME HERE:8530 /F
REG Add HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate /v WUStatusServer /t REG_SZ /d http:// SERVERNAME HERE /F
net stop wuauserv /y
net stop BITS /y
rd C:\WINDOWS\SoftwareDistribution /s /Q
regsvr32 WUAPI.DLL /s
regsvr32 WUAUENG.DLL /s
regsvr32 WUAUENG1.DLL /s
regsvr32 ATL.DLL /s
regsvr32 WUCLTUI.DLL /s
regsvr32 WUPS.DLL /s
regsvr32 WUPS2.DLL /s
regsvr32 WUWEB.DLL /s
regsvr32 msxml3.dll /s
net start wuauserv /y
wuauclt.exe /resetauthorization /detectnow
————Copy Everything Above This Line————
1. Copy this script to a txt doc and save as a batch file.
2. Change this line to match your server path
3. FYI: The number at the end of the server path above is a port number, this may not be needed for your implementation.
***Make sure NO word wrap is happening in your script
This information is provided "AS IS" with no warranties expressed or implied.