Several servers in our environment are not able to "run as administrator" without receiving the message "There are no more endpoints available from the endpoint mapper." This is mostly happening with Server 2012. On Some of our Server 2016 machines, if you "run as admin" the program just doesn't start, so I'm assuming the same issue just without the pop up message.
I don't know what information is important. We have 3 DCs, AD DS is running. I've run a dcdiag and got some passes and some failures and warnings. I don't know which are important or even if that's relevant. I can past the report here if needed.
On the machines with the failure, Windows Firewall is on. They do have AV but we've tested with it off and it doesn't change it. We've restarted servers as well and they are all patched and updated.
I know they're old, and we're moving to change that before EOL on 2012, but we're stuck on a version of software and db that we're working to update but the vendor has given us problems, so "move to 2022 isn't in the cards...yet.