Run Jellyfin through VPN provider's IP and Port, instead of ISP & router

[TheDreadPirate]

When you are using NordVPN, and other VPN services like it, you are sharing a publicly facing exit node IP with thousands and thousands of users. There is no way for the VPN service to route unsolicited requests from the Internet to you. Running a server requires some level of stability on the server side regarding IP and port. Which is impossible with privacy VPN services like Nord.

And it sounds like your ISP is using CGNAT, which puts you in a similar situation as using NordVPN where you don't have connection stability and routability for hosting a service.

So the solution is to have an external proxy. This gives you the connection stability to reliably host a service. Then you let the wireguard client on your home server running jellyfin handle the changes in your connection.

Tailscale is also a solution if all the clients you have can install the app.