I just yesterday discovered that my Overseerr was displaying the initial setup page when visiting its WebUI. Thanks to the Post Guidelines, I started digging into the logs and saw that it stopped finding the Plex server about six days ago, reporting an ECONNREFUSED: https://gist.github.com/SturmB/3c59f5c6f6dafb9d25fac14d7485327fj
I've checked that Plex is still very much available remotely, even through the internet, at the default port. I have made absolutely no changes to my setup for a long time, so I do not understand why Overseerr is suddenly getting ECONNREFUSED.
I am using TRaSH guides and have both Plex and Overseerr running in Docker containers (lscr.io/linuxserver/plex:latest and lscr.io/linuxserver/overseerr:latest, respectively) on the same Docker network. They are accessed through SWAG, a reverse-proxy. Again, no changes have been made to any of this setup for many months. The only thing that has changed recently is sharing my Plex libraries with three new users.
What can I do to get it to see Plex again? Do I need to go through that first-time setup again as shown in the attached screenshot? Will that destroy the history of users and requests and such?