Problem while reverse proxying jellyfin

Are you trying to connect to your server from inside of the same network? Try connecting to it from your phone over your cellular connection (not wifi) to see if it works.

To quote Matt’s guide on home networks:

What I do personally is I also also expose my server on some other port like 8000 so it’s accessible inside my local network over HTTP, but running a DNS server is a better solution if you’re willing to spend a bit more time setting that up. Here’s how it looks for me:

jellyfin.example.com, :8000 {
	reverse_proxy 127.0.0.1:8096
}