I have tried to make my own server long time already. First I just made basic server. No plugins or something like that. It said "Server is offline" or
"Connection lost" and something with java. So I thought I login with my other account and tried that server. There I tried to join server and said "Player not white listed" or something like that. I restarted and typed to console /whitelist add (my name) and still didn't work. So I changed setting now without white list. Then it said again that "Connection lost" after restarts it said "Server offline". When my brother joined it said that wrong version use 1.12... Then I changed Ip again because I thought it was already in use. Still it's not working. What should I do??