Wsus client not updating
Since you have a WSUS server in the main office you started deploying one in every company’s branch office.
From now on the WSUS servers from the branch offices will download updates either from the main site WSUS server or from Microsoft, then clients will get their updates from their local WSUS server.
Another important setting before we click Next, is to check the box This is a replica of the upstream server.
Enabling the box is what makes this WSUS server act as a replica server for another one.
All you have to do now in order for the branch office clients to get updates, is to approve those updates. Again, this is controlled from the upstream server.If you try to approve them from one of the replica servers, you are out of luck. On this one the option to approve updates for clients is working just fine.