For some reason I can't imagine I can no longer access my Usermin page at all. Accessing my domain/IP via the 20000 port simply hangs the page and it keeps loading forever. Occasionally, it eventually gives up and in the case of Chromium, it gives the "didn't send any data" error. The odd thing is that this didn't happen before. I've had my server up and running for a year or so and I never had any issues accessing the Usermin page. This problem has been here for a few months now, but right now I actually need to access it to configure some stuff.
I've tried the usual stuff. Updating the packages, restarting the server, restarting the Usermin service, temporarily disabling the firewall, checking to see if said firewall is configured (it is), and other than that I can't think of anything else that could be wrong. I'm running Virtualmin on a Debian 9 VPS. I've searched this issue and found nothing about it anywhere, and I'm completely lost as to what to do next. Any advice?