Can we give more details? What error are you seeing?
What OS is the server on?
What version of Jellyfin server?
What client are you using?
What OS is the client on?
Are you having trouble connecting on the same LAN or remotely?
Jellyfin 10.10.3 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)