I have a server, which i host from my own pc. This is a hamachi server(I can't use my own IP, it's busy or something), everyone that connects are connected to my hamachi - just telling you. I have both vanilla and bukkit server(they don't effect each other), vanilla one works fine - everyone can connect. Every time I turn my bukkit-pluggined-server on - noone(except me) can connect to the server. I tried to find the answer on forums, but none of posts about this problem got any solution.
Here is some of the stuff i have in my options:
EDIT: This problem have been solved by downloading bukkit instalator. A mod can delete it if he/she wants to.