I have been having an issue every month where many of my clients do not reboot after installation. The status of many of the computers remains at “reboot pending”. If you have this issue, look at the PatchUIMonitor log and look for the following error.

System reboot request InitiateSystemShutdown failed with Error (1271) PatchUIMonitor 8/16/2005 2:07:29 AM

Error 1271 = The machine is locked and can not be shut down without the force option."

Add the /f switch to your patch program so it looks like this:

PatchInstall.exe /g:336 /z:s /f /s /q /c:5 /t:60 /m:"PatchAuthorize.xml"

This should help you out if you have clients with this error code. If you are interested in what the switches mean, check out my article.