Me and my friend have been trying to make our own minecraft server, I got the Minecraft_Server from minecraft.net, and I've got my friend in my server on hamachi, I've been putting the server on, but my friend can't connect to it and we can't seem to find our problem.

#Minecraft server properties

#Sun Mar 25 03:35:19 BST 2012

allow-nether=true

level-name=world

enable-query=false

allow-flight=false

server-port=7902

level-type=DEFAULT

enable-rcon=false

level-seed=

server-ip=***.*****

max-build-height=256

spawn-npcs=true

white-list=false

spawn-animals=true

online-mode=true

pvp=false

difficulty=1

gamemode=0

max-players=3

spawn-monsters=true

generate-structures=true

view-distance=10

motd=A Minecraft Server

If you find a fault in this please reply, or if anything else not to do with the file is wrong, please do tell me.