Using Arch linux as server, but having problems

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http://www.linuxquestions.org – So I have a standard install of Arch with KDE4 installed that's kept more or less up-to-date (say about 5-7 days lagtime for -Syu), and I have the computer currently running as a Minecraft server. What the problem is that whenever I run: java -Xms1024M -Xmx1024M -jar minecraft_server.jar The server is running fine, people can connect to it, but then, if I leave it for some time (I haven't determined how long this time is), the server won't accept any more connections, anyone trying to connect gets a "Error: Connection timed out", and then when I wake the computer (which I think is (HowTos)