Can't open Roon Server from Asustor Portal again

“Safari can’t open the page 192.168.0.33/RoonServer because Safari can’t connect the the server 192.168.0.33”
Well, I am connected in Safari to 192.168.0.33 so that makes no sense. I am clicking the Roon Server icons on the NAS portal on that address.
The Roon server is running fine.

I’ve emptied cache, restarted my NAS and Mac. Will try restarting the router -what else could I try?

Oh. Maybe nothing is supposed to happen when I click the Roon Server icon?
I could have sworn it used to open a new window with some user interface in it, but now it’s not even trying to open a window.

The Roon Server does not have a UI - it runs in the background. Only Roon and Roon ARC have UIs.