I have a WSUS v3.2.7600.226 server, running on Win 2008 R2. It has 150+ clients, including some Win 2012 R2 clients. All has been working fine for a few years. Now I am seeing an odd problem.
Yesterday I created 2 new Win 2012 R2 clients, and Group Policy set them to use the WSUS server, as usual. But the odd thing: Only 1 client at a time shows up, they both won't show at the same time. Here's what I mean: 2 clients, SERVER8 and SERVER9. Neither was showing up in the "All Computers" group, so I went to each, restarted the BITS and Windows Update service, and issued a "wuauclt /resetauthorization /detectnow". This is what I usually do for Win 2008 R2 clients, who are having problems communicating with the WSUS server. So I did that on SERVER8, and it then showed up in WSUS. I then did the same on SERVER9. Oddly, SERVER8 then disappeared from WSUS, and SERVER9 showed up. It's like I can have one or the other, but not both at the same time. :-) DNS is correct, each shows the proper IP address (when it does show up). I see nothing in the Windows Event Logs of the WSUS server. I don't see any errors in the WindowsUpdate.log file of the server. And I see no errors in that file on the clients - in fact, I see things like "4 updates detected", but nothing after to indicate why it's dropping off the list. Ideas? Where to go next?
