1. Go to the offical Bukkit site and download the version you need: http://dl.bukkit.org/downloads/craftbukkit/ 2. Add the .jar file to the server Minecraft foder 3. Edit you .bat file and enter the new name of the .jar file 4. Start and have fun!
Well... we have exactly the same problem with our server. As we changed from 1.4.1 to 1.4.4 its quit often that we see "[WARNING] Can't keep up! Did the system time change, or is the server overloaded?" we tried already to deactivate some plugins but nothing really helped.....
May it’s an incompatible plugin ore something in the Craftbukkit version... We will see next week when 1.4.5 is released
We had the same problem on our server after the upgrade to 1.4.2. It was because some funny people had placed millions of Beacons near the spawn and after some people tried to connect again they get exactly this message…. After this we blocked completely the Beacon…