I hosted a server a couple of days ago and was working fine, but the next day my friends couldn't join using my external IP, and neither could I. I'm using Tekkit but it isn't the cause of the issue as it was working fine yesterday
However, I can still join using the address localhost and my IPv4 address. I don't know what's going on! Could someone help? Here is my server settings file:
#Minecraft server properties
#Fri Sep 13 19:38:59 CST 2013
allow-nether=true
level-name=world
enable-query=false
allow-flight=false
server-port=25565
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=true
difficulty=1
gamemode=0
max-players=20
spawn-monsters=true
generate-structures=true
view-distance=10
motd=A Minecraft Server2 Answers
It sounds like you have a dynamic external IP which means it changes periodically. Type "what is my ip" into google to find your current IP. If you want a static IP (i.e. One that doesn't change), you'll have to contact your ISP.
This happens many times to me, all you have to do is do 'ipconfig' in CMD prompt or 'ifconfig' in linux command line and search for your IPv4 address and then go to your router BIOS by typing in the default gateway into your browser. Then change your port forwarding settings to your new ip, and it should work fine.
