Sorry was busy but wanted to make the comment at least earlier. I think .local is specific to mDNS, but using just the hostname (ie; mypcname) should work as well.

DNS hostnames

Proton has pretty poor third party support

Xpipe does ssh and sftp pretty well, the rest can be done with htop and stuff if you need detailed system stats to diagnose something.

127.0.0.1 is localhost which sounds right if prowlarr is in the same machine as the other services.

Is prowlarr running?

Most likely an update broke something if it suddenly stopped working.

Same, if I'm wrong about something I'd love to hear what it is.

So this generally happens because there's too much overlap between the APs, try reducing transmit power on the 2.4ghz radio on the extender.

Also making sure that fast roaming is enabled on both APs should help.

You can also try enabling minimum RSSI on the extender 2.4ghz radio if it supports that.

Debian is always the answer for a stable, easy to set up server OS.

You don't need to use Docker if you don't want to, you can install Plex/Jellyfin using their normal apt repos instead.

Bonus round: anyone who’s ever transferred Plex servers from win to Linux (insert flavor), is it actually possible to keep my collections and playlists and stuff?

Yes, transfer your plex database and that will come with it.

No, but you should already have good backups in place (right??) so restoring if something breaks isn't too hard.

The 'Steam Controller' I think it was called? That thing was so awful I only used it like twice.

It's not self-hosted, but Tailscale funnels are also an option.

Yeah it's wild, the larger the channel width in use the faster it drops off too.

6GHz Wifi is even shorter range!