This WSUS Troubleshoot guide provide troubleshooting client machines which may be failing to report back to the WSUS Server. As well This guidance provide main Troubleshoot steps in WSUS server end. This May be most useful for Administrators who are work with WSUS and facing Windows Updates Issues.

Below area are included into this document.

 When Client PCs installed by using clone/ghost image they have same susclient GUID. It should be deleted to report that client to WSUS properly as below,

a. Stop the automatic service 
b. Delete the SUSclientID reg key

HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate

c. Restart the automatic service  
d. Run wuauclt /resetauthorization /detectnow  
e. Run wuauclt /reportnow