Android apps can't connect on my server

[monocle]

I'm found something similar.

Internal to my network, Jellyfin runs on fin.local.domain:8096, that works fine. Downloaded and installed yesterday, using standard "debuntu" method.

Externally I want it to run as https://buildingname.external.domain:4114/

I'm no stranger to networking, and I have a valid (issued today) Let's Encrypt cert (using the DNS challenge method, due to not-standard port).

Nginx reverse proxy configured to listen on port 4114 and forward traffic to localhost:8096

Main building router forwards buildingname.external.domain:4114 to fin.local.domain:4114

curl https://buildingname.external.domain:4114/ works as expected and validates the cert.

On my Android 11 device I have Jellyfin 2.5.3 installed today from F-Droid.

I tried a couple of variations of buildingname.external.domain:4114 and https://buildingname.external.domain:4114 in the app but I kept getting

"Connection could not be established.
Please check the hostname and your network connection."

The culprit I found was the example config has buried in the middle this redirection:

Code:

    location = / {
        return 302 http://$host/web/;
        #return 302 https://$host/web/;
    }

If you simply swap the '#' to flip which line is commented out, it still doesn't work because you need to add the non-standard port to the redirect:

Code:

        return 302 https://$host:4114/web/;

With that it was fixed.