I think there is a bug with Pistons, which causes my server to crash daily around the same time, (11pm EST) every day. Code: 2011-07-13 10:11:57 [SEVERE] java.lang.NullPointerException 2011-07-13 10:11:57 [SEVERE] at net.minecraft.server.TileEntityPiston.a(SourceFile:100) 2011-07-13 10:11:57 [SEVERE] at net.minecraft.server.TileEntityPiston.g_(SourceFile:145) 2011-07-13 10:11:57 [SEVERE] at net.minecraft.server.World.cleanUp(World.java:1124) 2011-07-13 10:11:57 [SEVERE] at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:447) 2011-07-13 10:11:57 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361) 2011-07-13 10:11:57 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:422) 2011-07-13 10:11:57 [SEVERE] Unexpected exception java.lang.NullPointerException at net.minecraft.server.TileEntityPiston.a(SourceFile:100) at net.minecraft.server.TileEntityPiston.g_(SourceFile:145) at net.minecraft.server.World.cleanUp(World.java:1124) at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:447) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361) at net.minecraft.server.ThreadServerApplication.run(SourceFile:422) 2011-07-13 10:12:33 [INFO] Connection reset 2011-07-13 10:12:34 [INFO] Connection reset 2011-07-13 10:12:55 [INFO] Read timed out