first, make it "127.0.0.1" in Config.lua
restart OT
try login with Ipchanger using address "127.0.0.1"..
Does it work?
if so, continue, find out your ip address:
http://www.whatsmyip.org/
copy your IP address and paste it into config.lua, and restart the server.
And now, try login with ip-changer using your Ip address you got from that homepage.
if it works, you're good to go.