All of a sudden multiplayer doesn't work..

[Gaasky]

So, I used to play with a friend on multiplayer, everything was going on fine, now a few days later, we tried everything to make it work but it just won't. We checked if his ports were open, they were, if his IP changed, it did and I connected to the right one, still nothing working. Now I don't know if it's just my error but it won't do anything but say "Couldn't establish network communication with server."
Any help is appreciated .

[Koub]

We'll need logs from both of you to try and understand what's going on.

[Gaasky]

Well I'll be the one hosting the server from another house tomrrow, we'll see if it's an internal problem then.

[Taratsamura]

i have the exact same problem. we played together last week but this weekend, we cant!
And after he tried several times to join my game and i wanted to quit i got an error.

0.007 2016-04-16 20:59:07; Factorio 0.12.29 (Build 17931, win64, steam)
0.007 Operating system: Windows 10
0.007 Program arguments: "G:\Steam\steamapps\common\Factorio\bin\x64\Factorio.exe"
0.007 Read data path: G:/Steam/steamapps/common/Factorio/data
0.007 Write data path: C:/Users/Krebs/AppData/Roaming/Factorio
0.007 Binaries path: G:/Steam/steamapps/common/Factorio/bin
0.048 Graphics options: [FullScreen: false] [VSync: true] [UIScale: 100%] [MultiSampling: OFF] [Graphics quality: normal] [Video memory usage: high] [Light scale: 20%] [Screen: 1]
0.048 Available display adapters: 2
0.048 [0]: \\.\DISPLAY1 - NVIDIA GeForce GTX 970 {0x01, [-1920,0], 1920x1080, 32bit, 60Hz}
0.048 [1]: \\.\DISPLAY2 - NVIDIA GeForce GTX 970 {0000, no details}
0.048 [4]: \\.\DISPLAY5 - Intel(R) HD Graphics 4600 {0x8000005, [0,0], 1920x1080, 32bit, 60Hz}
0.049 Create display on adapter 1. Size 1280x720 at position [310, 162].
0.232 Initialised Direct3D:[0] Intel(R) HD Graphics 4600; driver: igdumdim64.dll 20.19.15.4331
0.266 Desktop composition is active.
0.402 Loading mod core 0.0.0 (data.lua)
0.422 Loading mod base 0.12.29 (data.lua)
1.081 Loading mod bobconfig 0.12.2 (data.lua)
1.111 Loading mod boblibrary 0.12.3 (data.lua)
1.144 Loading mod bobassembly 0.12.7 (data.lua)
1.174 Loading mod bobenemies 0.12.6 (data.lua)
1.209 Loading mod bobores 0.12.7 (data.lua)
1.252 Loading mod bobtech 0.12.4 (data.lua)
1.288 Loading mod bobplates 0.12.10 (data.lua)
1.344 Loading mod bobelectronics 0.12.6 (data.lua)
1.387 Loading mod boblogistics 0.12.7 (data.lua)
1.446 Loading mod bobmining 0.12.3 (data.lua)
1.519 Loading mod bobpower 0.12.6 (data.lua)
1.574 Loading mod bobwarfare 0.12.9 (data.lua)
1.648 Loading mod bobmodules 0.12.9 (data.lua)
1.740 Loading mod bobconfig 0.12.2 (data-updates.lua)
1.807 Loading mod bobassembly 0.12.7 (data-updates.lua)
1.878 Loading mod bobenemies 0.12.6 (data-updates.lua)
1.972 Loading mod bobores 0.12.7 (data-updates.lua)
2.043 Loading mod bobtech 0.12.4 (data-updates.lua)
2.115 Loading mod bobplates 0.12.10 (data-updates.lua)
2.211 Loading mod bobelectronics 0.12.6 (data-updates.lua)
2.284 Loading mod boblogistics 0.12.7 (data-updates.lua)
2.369 Loading mod bobmining 0.12.3 (data-updates.lua)
2.449 Loading mod bobpower 0.12.6 (data-updates.lua)
2.523 Loading mod bobwarfare 0.12.9 (data-updates.lua)
2.620 Loading mod bobmodules 0.12.9 (data-updates.lua)
2.692 Loading mod bobelectronics 0.12.6 (data-final-fixes.lua)
3.531 Initial atlas bitmap size is 8192
3.538 Created atlas bitmap 8192x8181
3.538 Created atlas bitmap 8192x3345
16.569 Sprites loaded
16.800 Loading sounds...
18.467 Factorio initialised
51.113 Info Scenario.cpp:124: Map version 0.12.29-0
69.320 Info Router.cpp:507: Router peerID(65535) shutting down.
69.320 Info Router.cpp:534: Router state -> Disconnected
69.320 Info MultiplayerManager.cpp:912: networkTick(0) mapTick(-1) changing state from(Ready) to(PreparedToHostGame)
69.320 Info MultiplayerManager.cpp:912: networkTick(0) mapTick(-1) changing state from(PreparedToHostGame) to(CreatingGame)
69.321 Info Scenario.cpp:124: Map version 0.12.29-0
69.386 Info MultiplayerManager.cpp:281: 0000023AE7F177C0, 0000000000000000
69.386 Info WindowsUDPSocket.cpp:73: Opening socket at port (34197)
69.386 Info Router.cpp:534: Router state -> Connected
69.386 Info Synchronizer.cpp:54: NetworkTick(0) initialized Synchronizer local peer(0) latency(15).
69.386 Hosting game at port 34197, peerID 0, session magic 2153
69.386 Info MultiplayerManager.cpp:303: 0000023AE7F177C0, 0000023AE7F177C0
69.386 Info MultiplayerManager.cpp:912: networkTick(0) mapTick(0) changing state from(CreatingGame) to(InGame)
69.386 Info NetworkInputHandler.cpp:45: mapTick(0) networkTick(0) initialized NetworkInputHandler local peer(0).
69.620 Info MultiplayerManager.cpp:1411: Received peer info for peer(0) username(Taratsamura).
69.620 Info MultiplayerManager.cpp:1059: networkTick(15) mapTick(15) received stateChanged peerID(0) oldState(Ready) newState(CreatingGame)
69.621 Info MultiplayerManager.cpp:1059: networkTick(15) mapTick(15) received stateChanged peerID(0) oldState(CreatingGame) newState(InGame)
69.654 Info NetworkInputHandler.cpp:728: mapTick(18) networkTick(18) connecting to player(Taratsamura).
69.654 Info NetworkInputHandler.cpp:582: assigning playerIndex(0) to peer(0)
69.654 Info GameActionHandler.cpp:1945: MapTick(18) processed PlayerJoinGame peerID(0) playerIndex(0) mode(create)
143.916 Info MultiplayerManager.cpp:133: NetworkTick(4473) disconnecting multiplayer connection.
143.917 Info NetworkInputHandler.cpp:64: expectedMapTick(4473) sending PlayerLeaveGame
144.184 Info MultiplayerManager.cpp:1455: Disconnect notification for peer (0)
144.184 Info MultiplayerManager.cpp:1009: networkTick(4488) mapTick(4489) removing peer(0) dropout(false)
144.184 Info MultiplayerManager.cpp:912: networkTick(4488) mapTick(4489) changing state from(InGame) to(InGameAligning)
144.184 Info MultiplayerManager.cpp:1697: networkTick(4488) mapTick(4489) starting mapAlign
144.184 Info MultiplayerManager.cpp:1611: networkTick(4488) mapTick(4489) adding mapAlignTask(RemovePlayerAlignTask)
144.434 Info MultiplayerManager.cpp:1059: networkTick(4503) mapTick(4489) received stateChanged peerID(0) oldState(InGame) newState(InGameAligning)
144.434 Info MultiplayerManager.cpp:1631: networkTick(4503) mapTick(4489) sending mapAlignAction
144.684 Info MultiplayerManager.cpp:1305: networkTick(4518) mapTick(4489) received MapAlignAction from peer(0), mapAlignTick(4490) appliedTickClosuresCount(0)
144.684 Info MultiplayerManager.cpp:1713: networkTick(4519) mapTick(4489) mapAlign finished targetTick(4490) updating map and running the tasks ...
144.684 Info MultiplayerManager.cpp:1585: networkTick(4519) mapTick(4489) peerID(0) fullStateLog: local state(InGameAligning) local peers(((peerID(0) state(InGameAligning) mapAlignTick(4490))
)
144.684 Info MultiplayerManager.cpp:1732: maptick(4490) crc before applying all ticks: -510793287
144.684 Info NetworkInputHandler.cpp:644: applyAllTickClosures: expectedMapTick(4490) lastTickApplied(4472) referenceMapTick(4490) networkTick(4519)
144.684 Info NetworkInputHandler.cpp:668: applyAllTickClosures: applying tickClosure(tick(4473) inputActions((PlayerLeaveGame) ) ) for peer(0)
144.684 Info NetworkInputHandler.cpp:527: expectedMapTick(-1) removing peer(0) success(true).
144.684 Info GameActionHandler.cpp:1967: MapTick(4490) processed PlayerLeaveGame peerID(0) playerIndex(0)
144.684 Info MultiplayerManager.cpp:1740: maptick(4490) crc after applying all ticks: -1959921117
144.684 Info MultiplayerManager.cpp:912: networkTick(4519) mapTick(4490) changing state from(InGameAligning) to(InGameAligned)
Factorio crashed. Generating symbolized stacktrace, please wait ...
c:\cygwin64\tmp\factorio-vbn8ul\libraries\stackwalker\stackwalker.cpp (923): StackWalker::ShowCallstack
c:\cygwin64\tmp\factorio-vbn8ul\src\util\logger.cpp (306): Logger::writeStacktrace
c:\cygwin64\tmp\factorio-vbn8ul\src\util\logger.cpp (360): Logger::logStacktrace
c:\cygwin64\tmp\factorio-vbn8ul\src\util\crashhandler.cpp (84): CrashHandler::writeStackTrace
c:\cygwin64\tmp\factorio-vbn8ul\src\util\crashhandler.cpp (174): CrashHandler::SignalHandler
f:\dd\vctools\crt\crtw32\misc\winxfltr.c (372): _XcptFilter
f:\dd\vctools\crt\crtw32\startup\threadex.c (378): _callthreadstartex$filt$0
f:\dd\vctools\crt\crtw32\misc\amd64\chandler.c (162): __C_specific_handler
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFD5C8E9AED)
00007FFD5C8E9AED (ntdll): (filename not available): _chkstk
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFD5C874FE9)
00007FFD5C874FE9 (ntdll): (filename not available): RtlImageNtHeaderEx
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFD5C8E8BFA)
00007FFD5C8E8BFA (ntdll): (filename not available): KiUserExceptionDispatcher
c:\cygwin64\tmp\factorio-vbn8ul\src\surface\surface.cpp (309): Surface::findNearestEnemy
c:\cygwin64\tmp\factorio-vbn8ul\src\entity\character.cpp (1600): Character::getShootingTarget
c:\cygwin64\tmp\factorio-vbn8ul\src\graphics\cursorrenderer.cpp (116): CursorRenderer::renderPlayerCursor
c:\cygwin64\tmp\factorio-vbn8ul\src\graphics\cursorrenderer.cpp (58): CursorRenderer::prepare
c:\cygwin64\tmp\factorio-vbn8ul\src\graphics\gamerenderer.cpp (120): GameRenderer::prepareJob
c:\cygwin64\tmp\factorio-vbn8ul\src\gameview.cpp (774): GameView::prepareRender
c:\cygwin64\tmp\factorio-vbn8ul\src\game.cpp (256): Game::prepareRender
c:\cygwin64\tmp\factorio-vbn8ul\src\mainloop.cpp (221): MainLoop::prepare
c:\cygwin64\tmp\factorio-vbn8ul\src\mainloop.cpp (473): MainLoop::tickStep
c:\cygwin64\tmp\factorio-vbn8ul\src\mainloop.cpp (576): MainLoop::run
c:\cygwin64\tmp\factorio-vbn8ul\src\main.cpp (493): wmain
f:\dd\vctools\crt\crtw32\startup\crt0.c (255): __tmainCRTStartup
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFD59DD8102)
00007FFD59DD8102 (KERNEL32): (filename not available): BaseThreadInitThunk
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFD5C89C5B4)
00007FFD5C89C5B4 (ntdll): (filename not available): RtlUserThreadStart
146.633 Error Util.cpp:78: Unexpected error occurred. You can help us to solve the problem by posting the contents of the log file on the Factorio forums.

[Taratsamura]

ok, solved the Problem.
For some reason Factorio gets blocked.
So i changed my firewall settings to always allow Factorio

Normaly it should ask if it should block a programm, but it didnt and just blocked it.