Android apps can't connect on my server

[TheDreadPirate]

Hi bitmap, and thank you very much for your quick answer ! Here is the asustor tutorial I used to obtain my Let's Encrypt certificate, worked like a charm, I can access my NAS from everywhere in htpps :

https://www.asustor.com/en/online/Colleg...c=324#hs32

And here's the one I used to make a reverse proxy for my Jellyfin server. Again, working flawlessly on a web browser, but it's a no no with JF android app :

https://www.asustor.com/en-gb/online/Col...c=325#rp33

Since it work in a web browser, I assumed it's a certificate problem, but again, I really suck at those networking shanigans... It was already a pain in the a** for me to get all that thing working in the fisrt place.

If I can provide more infos, just ask.

When you access from a browser, there is no security warning about your cert, correct?  What kind of Android device are you using?  What version of Android?

I think i have the same issue as you.
I run a jellyfin server behind traefik and i can't connect from my android tv or my phone when i'm connected to my wifi.
When using mobile data i can connect from my phone without any issues.
Also accessing the web interface via the browser works fine even with wifi.
Once logged into the app everything works also on wifi.
I also tested iOS and webOS which both worked fine.
As a workaround i just use the servers ip to connect which works fine.

Without know more about your setup its hard to say what is going on.  If your traefik reverse proxy local?  Or hosted outside your home?