Before i start, this tutorial will most likely only be usefull for beginners and something like this could be posted already. I was bored and made this. So, you've made yourself a bukkit server but you (our your friends) can't connect. Try this steps first! Step 1, Port forwarding I forgot to do this to and my friends couldn't join. Bukkit uses port 25565 (if you didn't change it). Make sure that port is set 'open' on your router. Step 2, Firewall If you're running Bukkit on your PC (especially Windows) the firewall might be blocking your server from connecting to the internet. Solve this (in Windows) by going to windows firewall and create a new exception. (i don't know how it's called exactly...) Step 3, Minecraft SP Are your friends using MinecraftSP or any other free minecraft launcher? If so, you'll have to set your server to offline mode or they won't be able to connect. How to do this? Go to your Bukkit directory and open server.properties in Notepad. Set online mode to false. In linux server, use vi to edit the server.properties file. Step 4, Internet connection This might seem obvious (OK it is...) but you need internet connection. Maybe your friend, you or the server has no internet connection. Still not able to connect? Ask the forum, Post a thread on the bukkit forum under Bukkit Help. Make sure you type the error the console gives you in your thread. This could help people recognise the problem. Know that the problem doesn't have to be the server. It can also be your friend that has the problem. In that case, there is not much you can do.