Can't connect android devices on local network to server. Other devices can connect.

[pcm]

The phone however I still can't figure out. It isn't able to discover any servers, and when I enter the IP address, still nothing.
I also tried ping from phone to PC and no response. Ping from PC to phone IP also does not work.
(I have been able to ping other devices such as my laptop from the PC, and other websites such as google.com from the phone.)

If I run 'arp -a' on the server PC it shows the IP address of the phone. But I cannot ping it.

ARP tables can be cached. May not be the latest info your PC has about what's on the network anymore (i.e STALE).

Code:

ip -s neigh

is a better bet for a more accurate info on what's immediately reachable by your computer.


The fact you're not able to ping your phone could mean your phone's not on the same network at that moment. Check your phone's wifi. Does it have an IP address configuration as per your router's specs ?
Are you able to see your phone on your router's admin panel ?

Are you trying to connect to jellyfin server using the app on your phone ? Can you try to connect to jellyfin using your phone's browser by typing in the jellyfin server's http://LAN-IP:PORT ?