Same problem, tried everything. Yesterday all was ok.
Maybe connection log will help:
<div class='codetop'>CODE</div><div class='codemain' style='height:200px;white-space

re;overflow:auto'>Log: ########### Finished loading level: 0.367444 seconds
Init: Game engine initialized
Log: Initializing Engine Completed
Log: >>>>>>>>>>>>>> Initial startup: 13.00s <<<<<<<<<<<<<<<
Log: GConfig::Find has loaded file: ..\UTGame\Localization\int\UTGameUI.int
Log: Kismet:
ScriptWarning: DemoGame RenXFrontend.TheWorld:PersistentLevel.DemoGame_0 (Function Engine.GameInfo:RestartPlayer:0087) bRestartLevel && !server, abort from RestartPlayer NM_Standalone
Error: Can't start an online game that hasn't been created
Log: FSTUNClient resolved stunserver.org (132.177.123.13)
Log: FSTUNClient starting test 1...
Log: Performing DNS lookup for stun.xten.com
Log: FSTUNClient resolved stun.xten.com (75.101.138.128)
Log: FSTUNClient starting test 1...
Log: FSTUNClient starting test 2...
Log: FSTUNClient test timeout, NAT is strict.
ScriptLog: Settings_0::ConditionalSaveProfile - Saving player profile.
ScriptLog: UTUIFrontEnd_LoginScreen::OnLogin() - Attempting to login with name 'Mike64m' bLocalOnly: False
ScriptLog: Login change...requerying profile data
Log: Browse: 78.129.164.83/RenXFrontend?Name=Mike64m?team=255
Init: WinSock: Socket queue 32768 / 32768
Log: Award progress has now been fully reenabled!
Log: LoadMap: 78.129.164.83/Renegade-Islands?Name=Mike64m?team=255
ScriptLog: Desc:
Log: Starting memory preloaded movie...UT_loadmovie5 ()
Log: Waiting for memory preloaded movie to finish loading ...
Log: Playing movie [UT_loadmovie5]
Log: Got memory preloaded movie event!!!
Log: ClearAllAnimSetLinkupCaches - Took 9.20ms
ScriptLog: Clearing online delegates for DemoPlayerController_0 (Player:LocalPlayer_0)
Log: WARNING: Failed to open/prepare movie 'UT_loadmovie5' for playback!
Log: Virtual memory allocation size: 278.42 MByte (291946496 Bytes)
Log: Physical memory allocation size: 0.00 MByte (0 Bytes)
Error: Objects Function RenX_SC.RenX_Connection:Accepted and StrProperty RenX_SC.RenX_Connection:sendNow.S have duplicate NetIndex 28
Error: Objects Function RenX_SC.RenX_Connection:Opened and Function RenX_SC.RenX_Connection:sendNow have duplicate NetIndex 29
Error: Objects Function RenX_SC.RenX_Connection:Closed and Function RenX_SC.RenX_Connection:sendCloseServer have duplicate NetIndex 30
Error: Objects StrProperty RenX_SC.RenX_Connection:ReceivedText.Text and Function RenX_SC.RenX_Connection

estroyed have duplicate NetIndex 31
Error: Objects Function RenX_SC.RenX_Connection:ReceivedText and Class RenX_SC.RenX_Connection have duplicate NetIndex 32
Error: Objects StrProperty RenX_SC.RenX_Connection:ReceivedLine.Line and RenX_Connection RenX_SC.Default__RenX_Connection have duplicate NetIndex 33
Error: Package 'RenX_SC' version mismatch
Log: -->"No connection" error - CREATE PC HACK
Log: -->"No connection" error - CREATE PC HACK GO
Log: Browse: RenXFrontend?Name=Mike64m?team=255?failed
Log: Failed; returning to Entry
Log: Award progress has now been fully reenabled!
Log: LoadMap: RenXFrontend?Name=Mike64m?team=255?failed
ScriptLog: Desc:
Log: Starting memory preloaded movie...UT_loadmovie4 ()
Log: Waiting for memory preloaded movie to finish loading ...
Log: Playing movie [UT_loadmovie4]
Log: Got memory preloaded movie event!!!
Log: ClearAllAnimSetLinkupCaches - Took 9.13ms
Log: WARNING: Failed to open/prepare movie 'UT_loadmovie4' for playback!
Error: Objects StrProperty RenX_SC.RenX_Connection:ReceivedLine.Line and RenX_Connection RenX_SC.Default__RenX_Connection have duplicate NetIndex 33
Error: Objects StrProperty RenX_SC.RenX_Connection:ReceivedText.Text and Function RenX_SC.RenX_Connection

estroyed have duplicate NetIndex 31
Error: Objects Function RenX_SC.RenX_Connection:ReceivedText and Class RenX_SC.RenX_Connection have duplicate NetIndex 32
Error: Objects Function RenX_SC.RenX_Connection:Closed and Function RenX_SC.RenX_Connection:sendCloseServer have duplicate NetIndex 30
Error: Objects Function RenX_SC.RenX_Connection:Opened and Function RenX_SC.RenX_Connection:sendNow have duplicate NetIndex 29
Error: Objects Function RenX_SC.RenX_Connection:Accepted and StrProperty RenX_SC.RenX_Connection:sendNow.S have duplicate NetIndex 28
Log: Virtual memory allocation size: 254.33 MByte (266686464 Bytes)
Log: Physical memory allocation size: 0.00 MByte (0 Bytes)
Log: Game class is 'DemoGame'
Log: Primary PhysX scene will be in software.
Log: Creating Primary PhysX Scene.
Log: *** WARNING - PATHS MAY NOT BE VALID ***
Log: Bringing World RenXFrontend.TheWorld up for play (0) at 2009.10.02-21.18.29
Log: Bringing up level for play took: 0.003380
Error: ReadOnlineStats() failed
ScriptLog: OnlineStats::OnReadComplete was not successful
Log: DemoPlayerController_1 got player LocalPlayer_0
Error: StartLocalVoiceProcessing(): Device is currently owned by another user
Log: ########### Finished loading level: 0.543584 seconds
Log: Kismet:
ScriptWarning: DemoGame RenXFrontend.TheWorld:PersistentLevel.DemoGame_1 (Function Engine.GameInfo:RestartPlayer:0087) bRestartLevel && !server, abort from RestartPlayer NM_Standalone
Error: Can't start an online game that hasn't been created
Log: URL: Adding default option Name=Mike64m
Log: URL: Adding default option team=255
Log: Browse: RenXFrontend?failed?Name=Mike64m?team=255
Log: Failed; returning to Entry
Log: Award progress has now been fully reenabled!
Log: LoadMap: RenXFrontend?failed?Name=Mike64m?team=255
ScriptLog: Desc:
Log: Starting memory preloaded movie...UT_loadmovie7 ()
Log: Waiting for memory preloaded movie to finish loading ...
Log: Playing movie [UT_loadmovie7]
Log: Got memory preloaded movie event!!!
Log: ClearAllAnimSetLinkupCaches - Took 8.71ms
ScriptLog: Clearing online delegates for DemoPlayerController_1 (Player:LocalPlayer_0)
NetComeGo: Close TcpipConnection_0 78.129.164.83:7777 10/02/09 21:18:29
Exit: closesocket error (0)
Exit: UTcpNetDriver shut down
Log: WARNING: Failed to open/prepare movie 'UT_loadmovie7' for playback!
Log: Virtual memory allocation size: 253.83 MByte (266162176 Bytes)
Log: Physical memory allocation size: 0.00 MByte (0 Bytes)
Log: Game class is 'DemoGame'
Log: Primary PhysX scene will be in software.
Log: Creating Primary PhysX Scene.
Log: *** WARNING - PATHS MAY NOT BE VALID ***
Log: Bringing World RenXFrontend.TheWorld up for play (0) at 2009.10.02-21.18.30
Log: Bringing up level for play took: 0.003499
Log: DemoPlayerController_2 got player LocalPlayer_0
Error: StartLocalVoiceProcessing(): Device is currently owned by another user</div>