Hey @shawn.m.leonard, can you provide more logs about the port being unavailable? Are you generating the noVNC URL yourself? Double check that you’re passing all of the required parameters that noVNC needs: https://sourcegraph.com/github.com/OSC/ondemand/-/blob/apps/dashboard/app/helpers/batch_connect/sessions_helper.rb#L184
noVNC is client side only, the browser itself needs to connect to WebSockify directly.
If you want a deeper look into how noVNC works in OnDemand, here’s a thread from the other day: Connecting to static VNC server