WSUS is running on Server 2019 and we have client machines running Server 2012, 2012R2 and 2019 Standard which are connected. Everything has been working without any problems for a number of months until suddenly the 2019 servers stop reporting their status. The last contact column updates OK and the servers are able to pull and install updates, just no reporting. The 2012 servers continue working OK. This happened about 6 months ago, we investigated with all the usual tricks, deleting the software distribution folder, resetting wsus client id's etc on some client machines but nothing worked. For no apparent reason all the 2019 servers started to work again. This time, everything stopped about 2 weeks ago. The SUSDB and the download folder have been deleted and all of WSUS reset in case the problem is with the WSUS server itself. This has not fixed the problem. As another test, stood up a 2012 R2 box, installed WSUS and pointed a couple servers over it. They report after about 15mins. Point them back to the original server and they will not report. Does this suggest that there is a problem with version 10 of WSUS running on Windows Server 2019? Any help, thoughts or suggestions gratefully received as I've no clue why this happens.

