You might notice that some computers are appearing multiple times in WSUSAdmin - Computers and some of them disappear very often. This is due to duplicate SUS client IDs. Take a look at this script which deletes duplicate SUS client IDs found on a computer. These IDs are often found on computers where the operating system was installed using an image-based setup.

Script Code

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@echo off
Echo Save the batch file "AU_Clean_SID.cmd". This batch file will do the following:
Echo 1.    Stops the wuauserv service
Echo 2.    Deletes the AccountDomainSid registry key (if it exists)
Echo 3.    Deletes the PingID registry key (if it exists)
Echo 4.    Deletes the SusClientId registry key (if it exists)
Echo 5.    Restarts the wuauserv service
Echo 6.    Resets the Authorization Cookie
Echo 7.    More information on http://msmvps.com/Athif
Pause
@echo on
net stop wuauserv
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v AccountDomainSid /f
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v PingID /f
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v SusClientId /f
net start wuauserv
wuauclt /resetauthorization /detectnow
Pause

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SUS client ID will be generated at next detection.