Bukkit using hamachi instead of external IP

I've had my bukkit server up for about a year now having my friends connect using my external ip like normal. I have just recently had users not being able to connect to my server, and am trying to fix the problem. It seems the server has begun using hamachi instead of my external ip for connection. Users with hamachi can log in through just fine, but I don't want that. I need help forcing bukkit to use my external IP.

 

Erase whatever number is under "ip-adress" in the "server.properties" file.

 

I did that, but it didnt help. Is there any other thing i could do?

 

delete hamachi

 

we tried removing hamachi, but that didnt work as well Do you know another thing that might be wrong?