Can't start a UT2004 Server

When I try to start a 'listen' UT2004 server the following error message pops up:

UT2004 Build UT2004_Patch_[2004-05-10_17.18]

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro-class processor @ 1542 MHz with 511MB RAM
Video: NVIDIA GeForce4 Ti 4200 (5672)

Dedicated server can't listen: TcpNetDriver: socket failed (275913044)

History: Listen <- UGameEngine::LoadMap <- LocalMapURL <- UGameEngine:rowse <- ClientTravel <- UGameEngine::Tick <- Level Albatross <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 676F4C57 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free

Sorry for posting all this gibberish but does anyone have an idea as to what is going wrong? I've done a fresh install and the problem is still there. I haven't patched the game and it's the DVD SE edition. This is really annoying me as I can't start a listen or a dedicated UT2004 server.

I checked my server log and once again, sorry for the gibberish, any help would be greatly appreciated.

Log: Log file open, 05/30/04 10:45:13
Init: Name subsystem initialized
Init: Detected: Microsoft Windows XP 5.1 (Build: 2600)
Init: Version: 3186 (127.29)
Init: Compiled: Mar 3 2004 02:43:29
Init: Command line: DM-1on1-Albatross?Game=XGame.xDeathMatch?bAutoNumBots=False?NumBots=5 -server -log=server.log
Init: Character set: Unicode
Init: Base directory: C:\UT2004\System\
Init: Ini:UT2004.ini UserIni:User.ini
Init: Build label: UT2004 Build UT2004_Build_[2004-03-03_02.42]
Init: Object subsystem initialized
Log: Global MD5: [3986c4774f86cab155ff9f5432b89282]
Log: Browse: DM-1on1-Albatross?Name=Al3x?Class=Engine.Pawn?Character=Cobalt?team=255?Sex=M?Game=XGame.xDeathMatch?bAutoNumBots=False?NumBots=5
Log: Collecting garbage
Log: Purging garbage
Log: Garbage: objects: 26396->26390; refs: 430320
Log: Game class is 'xDeathMatch'
Log: Failed to listen: TcpNetDriver: socket failed (275917116)
Critical: Dedicated server can't listen: TcpNetDriver: socket failed (275917116)
Critical: Windows GetLastError: The operation completed successfully. (0)
Exit: Executing UObject::StaticShutdownAfterError
Critical: Listen
Critical: UGameEngine::LoadMap
Critical: LocalMapURL
Critical: UGameEngine:rowse
Critical: UGameEngine::Init
Critical: InitEngine
Exit: Exiting.
Log: FileManager: Reading 0 GByte 35 MByte 1005 KByte 355 Bytes from HD took 0.315000 seconds (0.203000 reading, 0.112000 seeking).
Log: FileManager: 0.338999 seconds spent with misc. duties
Uninitialized: Name subsystem shut down
Uninitialized: Log file closed, 05/30/04 10:45:17

Scumgrief & GeneticFreak, thnx for your replies. A custom server.ini in combo with disabling various firewalls and a reinstall with no patch seems to have it fixed Bring on the onslaught!