Quote from sansavarous »Does the IP address you're giving your friend start with 192.168 or 10.0 ?
Find your IP address with http://ipchicken.com/
Quote from sansavarous »Is your friend typing letters or numbers?
Unknown Host is usually returned by DNS when a hostname lookup fails.
If you're using the IP address DNS should never enter the picture.
Double check that your friend is only entering the IP address.
Trusted and Established Minecraft Server Hosting since Alpha in 2010. Minecraft Server Host: www.minecraftserverhost.net
Test Servers: test.minecraft.ms | east.minecraft.ms | central.minecraft.ms | west.minecraft.ms
I am a representative of Minecraftserverhost.net