PMS settings unavailable from a local connection.

Since about 2-3 days now PMS running on Linux could not be accessed via plex.tv, so I tunneled in to connect to it locally and for some really awkward reason that just gives me the standard plex.tv/web/app interface without any menu or anything related to that specific server.

So I tried reinstalled PMS, and it still gives that same exact page.
here is a screenshot