machines did not report to the WSUS server. Maybe there is a connectivity issue, that the end machine cannot contact the WSUS server.

Run a client Diagnostic tool from Microsoft from the machine side.

http://technet.microsoft.com/en-us/wsus/bb466192.aspx

there are other tools to help you troubleshoot


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Two things you can do.

1) go to the client machine and go to windows updates page on the internet to see how many updates it is actually missing. This will tell you if it is getting updates or not. whether from the WSUS or internet.

2) Check the registry on the client machine to see where it is going to get it's updates. Here is where you want to check:

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]

and

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]

you can create a script file to run on the client to make sure that they are going to your WSUS server like this one:

START OF SCRIPT FILE:
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
"WUServer"="http://name or IP of WSUS server"
"WUStatusServer"="http://name or IP of WSUS server"

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
"AUOptions"=dword:00000004
"NoAutoRebootWithLoggedOnUsers"=dword:00000000
"NoAutoUpdate"=dword:00000000
"RescheduleWaitTime"=dword:00000001
"ScheduledInstallDay"=dword:00000000
"ScheduledInstallTime"=dword:00000000
"UseWUServer"=dword:00000001
END OF SCRIPT FILE

just make sure that you change the two lines that have the NAME OR IP OF WSUS SERVER to your server name or IP address. Best to use a DNS alias so that if you have to move the service to another server you just change the alias in DNS and all computers are up to date. then save the file as a .REG file and run that file on a client pc to test. after running it you can drop to cmd line and run:

wuauclt.exe /detectnow

this will force an immediate update. hope this helps!
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