I've had experience in hosting a Minecraft Classic server using MCForge but apparently running a Minecraft Beta server has a whole new line of problems. I Googled around the internet to find a proper mod to help me run the new server and I stumbled across Bukkit. After setting up everything I attempt to Log-in the server on my other PC with the correct IP address and Port Forward number and I am given the error as the title says. I use the IP address from whatsmyip.org and when I type it into minecraft it pretty much looks like this 00.000.00.00:25565 I've taken the time to upload pictures to make this as easy as possible. If you need anymore information please ask. Also can you tell me if I am missing anything or have done something wrong? Thanks.