Server shows offline

i have a server that is running, and i can connect to it locally with https://192.168.0.25:32400, but my windows app says its offline. i do get some error about rebind, but i dont understand any of that stuff. i have paid for my plex pass. i dont understandy why i have to have some wierd URL and I cant just connect directly to the plex server. my server is blocked from the outside completely. i just want something to play local content while devices are local. can i do that, or do i have to find a different server that doesnt expect me to want all that fancy stuff?