un pote fait un serveur minecraft ou il ne peut lui même se connecter sa copine à pu s'y connecter une fois et moi je n'y arrive pas on sais pas trop d’où ça viens le code d'erreur est souvent "End of the stream ou alors conection refused "

voila un copier-coller de la console :
[INFO] Starting minecraft server version 1.2.5
[WARNING] To start the server with more ram, launch it as "java -Xmx1024M -Xms1024M -jar minecraft_server.jar"
[INFO] Loading properties
[INFO] Starting Minecraft server on 5.87.179.154:25565
[WARNING] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[WARNING] The server will make no attempt to authenticate usernames. Beware.
[WARNING] While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[WARNING] To change this, set "online-mode" to "true" in the server.settings file.
[INFO] Preparing level "world"
[INFO] Default game type: 0
[INFO] Preparing start region for level 0
[INFO] Preparing spawn area: 73%
[INFO] Done (1,468s)! For help, type "help" or "?"

quelqu'un pour aider? =(