Jellyfin randomly stops allowing connections

[AlternateWitness]

Nothing happened, when I wanted to connect to my server on my local network on another device I got the "couldn't connect to server" error, in the sense it wasn't online. Both on my local network, and externally. I tried restarting my computer and starting Jellyfin, but now when I tried to log in through my server computer I got this error:

Connection Error

We're unable to connect to the selected server right now. Please ensure it is running and try again.

Only when running Jellyfin as an administrator could I log in on my computer, but I am still locked out from any other device. I didn't change anything, so I don't know what could be the problem? There's nothing off in the log files, remote connections are still enabled in the Jellyfin settings, what else does jellyfin require?

[Venson]

That sounds like you forgot to add the port forwarding rules for the ports jellyfin uses in your firewall on the PC.
The default port jellyfin uses is 8097

[AlternateWitness]

That sounds like you forgot to add the port forwarding rules for the ports jellyfin uses in your firewall on the PC.
The default port jellyfin uses is 8097

I originally set it up and it worked, I already have firewall exceptions set up.

After some investigating I found out that my computers internal IP changed(?) So I had to remap it.

[Venson]

That sounds like you forgot to add the port forwarding rules for the ports jellyfin uses in your firewall on the PC.
The default port jellyfin uses is 8097

I originally set it up and it worked, I already have firewall exceptions set up.

After some investigating I found out that my computers internal IP changed(?) So I had to remap it.

Yes that may happen. Check if your router allows either Static DHCP mapping for your PC or if you can set a custom DNS record.
What router do you have?