The full package won’t run on the server as the graphics card doesn’t support openGL so the standard package errors on startup. The advice here was to install the Server x64 package in order to run the Core.
Ah, I see that you put that in your initial post. Just for testing can you disable antivirus application on the server? Also both devices are on the same network?
Which apps did you let through? There are potentially 3 of them RoonAppliance, RoonServer and RAATServer.
To test, shutdown the firewalls completely on both machines and see if the remote can then see the server. And you should verify that all the devices are in the same subnet.
Further down the installation pipeline, Server might not have all the audio codecs, if not, you will have to install them yourself.
Hmm, maybe but not as good. If you care, take a dive into the forum and you can find some posts from years back where the devs explain their philosophy on UPnP and why RAAT.
BTW, Welcome to the forums! And, I’m just another user like you, a volunteer mod, not an official employee.