i replicated this on a single player test map to see if i got a different message. It was fine as long as i left it essentially idle for bit and built nothing. Once i got going I had put up a few wrath lamps 2 aqueos accumulators and had just finished building a boiler to test when I got the shutting down internal server screen.
http://pastebin.com/LtCuAMGT
Relevant portion:
2013-02-04 21:47:11 [INFO] [STDOUT] IC2 NEI Submodule initialized
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded ic2.neiIntegration.core.NEIIC2Config
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded gregtechmod.mistaqur.nei.NEI_GregTech_Config
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded ic2.advancedmachines.client.NEIAdvancedMachinesConfig
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded codechicken.enderstorage.NEIEnderStorageConfig
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded chb.mods.mffs.nei.NEI_MFFS_Config
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded mistaqur.nei.common.NEIPluginsConfig
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded com.shadwdrgn.soulshards.NEISoulShardsConfig
2013-02-04 21:47:11 [INFO] [STDOUT] Loaded codechicken.wirelessredstone.addons.NEIWirelessAddonConfig
2013-02-04 21:47:11 [INFO] [PortalGun] [1.4.7v2] Received world props from server.
2013-02-04 21:47:19 [INFO] [Minecraft] Saving and pausing game...
2013-02-04 21:47:19 [INFO] [Minecraft] Saving chunks for level 'test world'/Overworld
2013-02-04 21:47:20 [INFO] [Minecraft] Saving chunks for level 'test world'/Nether
2013-02-04 21:47:33 [INFO] [STDOUT] ComputerCraft: Searching for RedPowerWorld...
2013-02-04 21:47:33 [INFO] [STDOUT] ComputerCraft: RedPowerWorld and methods located.
2013-02-04 21:47:44 [INFO] [Minecraft] Giving Russrn 64 of Wrathlamp
2013-02-04 21:48:09 [INFO] [Minecraft] Saving and pausing game...
2013-02-04 21:48:10 [INFO] [Minecraft] Saving chunks for level 'test world'/Overworld
2013-02-04 21:48:10 [INFO] [Minecraft] Saving chunks for level 'test world'/Nether
2013-02-04 22:02:36 [INFO] [Minecraft] Giving Russrn 64 of Low Pressure Boiler
2013-02-04 22:03:16 [INFO] [Minecraft] Giving Russrn 64 of Solid Fueled Firebox
2013-02-04 22:03:28 [INFO] [Minecraft] Giving Russrn 64 of Aqueous Accumulator
2013-02-04 22:03:28 [INFO] [Minecraft] Giving Russrn 64 of Aqueous Accumulator
2013-02-04 22:03:40 [WARNING] [Minecraft] Can't keep up! Did the system time change, or is the server overloaded?
2013-02-04 22:03:45 [INFO] [Minecraft] Giving Russrn 64 of Liquiduct
2013-02-04 22:04:05 [INFO] [Minecraft] Giving Russrn 64 of Cobblestone
2013-02-04 22:04:31 [INFO] [Minecraft] Saving and pausing game...
2013-02-04 22:04:31 [INFO] [Minecraft] Saving chunks for level 'test world'/Overworld
2013-02-04 22:04:31 [INFO] [Minecraft] Saving chunks for level 'test world'/Nether
2013-02-04 22:04:49 [INFO] [Minecraft] Giving Russrn 1 of Diamond Pickaxe
2013-02-04 22:05:45 [INFO] [Minecraft] Giving Russrn 64 of Water
2013-02-04 22:06:06 [INFO] [Minecraft] Giving Russrn 1 of Prototype OmniWrench
2013-02-04 22:06:22 [INFO] [Minecraft] Saving and pausing game...
2013-02-04 22:06:22 [INFO] [Minecraft] Saving chunks for level 'test world'/Overworld
2013-02-04 22:06:22 [INFO] [Minecraft] Saving chunks for level 'test world'/Nether
2013-02-04 22:09:20 [WARNING] [Minecraft] Can't keep up! Did the system time change, or is the server overloaded?
2013-02-04 22:09:57 [WARNING] [Minecraft] Can't keep up! Did the system time change, or is the server overloaded?
2013-02-04 22:10:10 [INFO] [STDOUT] Stopping!
[22:11:11] [INFO] PastebinPoster.run:72:
http://pastebin.com/miFeYH0m