Quote Originally Posted by chilbs View Post
Running Newsid does not reset the required information in the registry for WSUS to work. As I found out to my cost. It can be reset by modifying the registry but I now always use sysprep.
You're right about newsid not changing the necessary info, but whether or not the WSUS SID is set shouldn't affect getting updates. What it does affect is the reporting - basically, it will look as if only one machine has got the updates but in reality they may all have updated.

This is because WSUS is not a push system - Windows Updates are always pulled down by the client. This means that if your WSUS server publishes updates then your clients will pull them down - it's just that you won't know it's worked.