I just installed this and wanted to get it working via Nginx Proxy Manager too. Right now it works perfect when accessed by the regular IP. Unfortunately, when I connect via Nginx Proxy Manager I get the outer GUI, minus the inside program GUI (see attached). This loading icon spins for about a minute and then shows server disconnected, error 1006 (see attached).
I am unsure as to what I need to do to access the program via NPM.