SOLVED: Jellyfin media player connection on same device

[Daxel]

I can't log in via jellyfin media player on the same PC where I installed my media server.
honestly, looking around I didn't find much, and I don't understand the reason for this, given that I set everything that could be done, such as certificates or Upnp for remote access.
some idea?

[TheDreadPirate]

What address are you typing into JMP?

[Daxel]

I'm using a "No-ip" hostname so I don't have to always enter the ip

[tmsrxzar]

if "on same device" means the device where jellyfin server is installed; check your network settings for bind addresses, it should not need any weird internet addresses as the local lan address or localhost should work - if you allow jellyfin to listen to localhost

[TheDreadPirate]

I'm using a "No-ip" hostname so I don't have to always enter the ip

Is your DDNS using your LAN IP or your WAN IP?  If the latter, do you have NAT loopback setup?

[Daxel]

Lan ip*

nat loopback?

[TheDreadPirate]

AFAIK, DDNS will not work with LAN IPs the way you think it will. Only WAN IPs.

NAT Loopback/hairpin is a router function that some routers have where it will keep traffic local if a DNS lookup resolves to itself. This allows you to use a DDNS or domain pointing to your public IP. But requires that a port forwarding rule be setup to function.

Instead of using DDNS, why not just use your server's local hostname. Most routers will support that.