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I was just trying out the PvP Production Score game mode for myself, in anticipation of a game with friends soon.
No one else was connected and I managed to play for some time.
However, at one point the message "pingpong1.factorio.com:34197 is not a valid address" popped op.
After pressing OK, it returned me to the game main menu.

I have set up the port forward this morning, port 34197 on UDP and that worked in the past (on another PC).
All references I find only refer to a version 0.14, no newer mentions seem to be there.

Can you help me out, as this PvP game might be rather close at hand.
Thank you in advance.

I think I have added the log section with the problem noted.

4989.289 Error ServerMultiplayerManager.cpp:95: MultiplayerManager failed: multiplayer.invalid-address("pingpong1.factorio.com:34197", "No such host is known. ")
4989.289 Info ServerMultiplayerManager.cpp:696: mapTick(163803) changing state from(InGame) to(Failed)
4989.289 Info NetworkInputListener.cpp:45: Refusing Input Action (0 65535 CheckCRCHeuristic) because multiplayer control is not ready
5002.294 Device reset internal.
5143.939 Info ServerMultiplayerManager.cpp:141: Quitting multiplayer connection.
5143.939 Info ServerMultiplayerManager.cpp:696: mapTick(163804) changing state from(Failed) to(Closed)
5143.978 Info HttpSharedState.cpp:54: Downloading https://multiplayer.factorio.com/remove-game/708074
5144.416 Info HttpSharedState.cpp:127: Status code: 200
5144.416 Info UDPSocket.cpp:206: Closing socket
5144.416 Info UDPSocket.cpp:236: Socket closed
5144.416 Info UDPSocket.cpp:206: Closing socket
5144.512 Info UDPSocket.cpp:206: Closing socket
5144.512 Info UDPSocket.cpp:236: Socket closed

My servers have been having this issue randomly.

DNS problem causes server to shut down, and not even attempt to save map.
Seems odd for a DNS problem.

0.000 2018-01-11 08:16:23; Factorio 0.16.16 (build 34924, linux64, headless)
0.028 Operating system: Linux (Ubuntu 18.04)
0.028 Program arguments: "/home/fact/fact-a/bin/x64/factorio" "--start-server-load-latest" "--server-settings" "/home/fact/fact-a/server-settings.json" "--rcon-port" "9100" "--rcon-password" "xxxxx" "--bind" "192.187.103.234:9000"
0.028 Read data path: /home/fact/fact-a/data
0.028 Write data path: /home/fact/fact-a [1736445/1877339MB]
0.028 Binaries path: /home/fact/fact-a/bin
0.039 System info: [CPU: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz, 8 cores, RAM: 15951MB]
0.040 Running in headless mode
0.043 Loading mod core 0.0.0 (data.lua)
0.051 Loading mod base 0.16.16 (data.lua)
0.124 Loading mod base 0.16.16 (data-updates.lua)
0.150 Checksum for core: 2242385247
0.150 Checksum of base: 354110265
0.218 Info PlayerData.cpp:65: Local player-data.json available, timestamp 1515680168
0.218 Info PlayerData.cpp:72: Cloud player-data.json unavailable
0.222 Custom inputs active: 0
0.223 Info Updater.cpp:750: Downloading https://updater.factorio.com/get-availa ... iVersion=2
1.451 0 packages available to download (experimental updates disabled).
1.453 Factorio initialised
1.454 Info ServerSynchronizer.cpp:29: nextHeartbeatSequenceNumber(0) initialized Synchronizer nextTickClosureTick(0).
1.454 Info ServerMultiplayerManager.cpp:696: mapTick(4294967295) changing state from(Ready) to(PreparedToHostGame)
1.454 Info ServerMultiplayerManager.cpp:696: mapTick(4294967295) changing state from(PreparedToHostGame) to(CreatingGame)
1.454 Loading map /home/fact/fact-a/saves/_autosave8.zip: 5166631 bytes.
1.462 Loading Level.dat: 10061257 bytes.
1.465 Info Scenario.cpp:135: Map version 0.16.16-4
1.624 Loading script.dat: 175 bytes.
1.625 Checksum for script /home/fact/fact-a/temp/currently-playing/control.lua: 477563344
1.626 Info UDPSocket.cpp:27: Opening socket at (192.187.103.234:9000)
1.626 Hosting game at 192.187.103.234:9000
1.626 Info HttpSharedState.cpp:54: Downloading https://auth.factorio.com/generate-server-padlock-2
1.763 Info HttpSharedState.cpp:127: Status code: 200
1.763 Info AuthServerConnector.cpp:109: Obtained serverPadlock for serverHash (Sy26BF7LQE8Gw9KJ4R7IccjEszCe2f6Q) from the auth server.
1.764 Info ServerMultiplayerManager.cpp:696: mapTick(288001) changing state from(CreatingGame) to(InGame)
1.764 Info ServerRouter.cpp:580: Asking pingpong servers (pingpong1.factorio.com:34197, pingpong2.factorio.com:34197) for own address
1.785 Info RemoteCommandProcessor.cpp:122: Starting RCON interface at port 9100
1.886 Info ServerRouter.cpp:475: Own address is 192.187.103.234:9000
2.054 Info ServerMultiplayerManager.cpp:625: Matching server connection resumed
7.274 ConnectionRequestReplyConfirm (type(ConnectionRequestReplyConfirm) ) from(206.128.79.109:63102)
7.274 Info ServerRouter.cpp:562: Generated hmac(LaHMpomXqbwDN1eYwqZ7Bw==) and serverKey(UrQtrAZti2QpCtbAzxXAmw==) for username(hedone) differ. Generated from message(hedone_Nl6C1OSNh/H0z96J/Oz98+ajAVYKR/NiCVYeQduCsI8=_180111134149).
7.274 Refusing connection for address (206.128.79.109:63102), username (hedone). UserVerificationMismatch
7.798 ConnectionRequestReplyConfirm (type(ConnectionRequestReplyConfirm) ) from(206.128.79.109:50084)
7.798 Info ServerRouter.cpp:393: Replying to connectionRequest for address(206.128.79.109:50084).
7.798 Info ServerSynchronizer.cpp:557: nextHeartbeatSequenceNumber(179) adding peer(1)
7.815 Info ServerMultiplayerManager.cpp:696: mapTick(288001) changing state from(InGame) to(InGameSavingMap)
7.900 Info ServerMultiplayerManager.cpp:792: mapTick(288001) received stateChanged peerID(1) oldState(Ready) newState(ConnectedWaitingForMap)
8.124 Info ServerMultiplayerManager.cpp:852: MapTick(288001) Serving map(/home/fact/fact-a/temp/mp-save-0.zip) for peer(1) size(5166543) crc(494921962)
8.124 Info ServerMultiplayerManager.cpp:696: mapTick(288001) changing state from(InGameSavingMap) to(InGame)
8.174 Warning TransmissionControlHelper.cpp:172: Fragment 0002 failed too many times
8.174 Warning TransmissionControlHelper.cpp:172: Fragment 10002 failed too many times
8.174 Warning TransmissionControlHelper.cpp:172: Fragment 20002 failed too many times
8.174 Warning TransmissionControlHelper.cpp:172: Fragment 30002 failed too many times
8.174 Warning TransmissionControlHelper.cpp:172: Fragment 40002 failed too many times
8.258 Info ServerMultiplayerManager.cpp:792: mapTick(288001) received stateChanged peerID(1) oldState(ConnectedWaitingForMap) newState(ConnectedDownloadingMap)
10.880 Info ServerMultiplayerManager.cpp:792: mapTick(288001) received stateChanged peerID(1) oldState(ConnectedDownloadingMap) newState(ConnectedLoadingMap)
11.376 Info ServerMultiplayerManager.cpp:792: mapTick(288030) received stateChanged peerID(1) oldState(ConnectedLoadingMap) newState(TryingToCatchUp)
11.410 Info ServerMultiplayerManager.cpp:792: mapTick(288032) received stateChanged peerID(1) oldState(TryingToCatchUp) newState(WaitingForCommandToStartSendingTickClosures)
11.411 Info GameActionHandler.cpp:3371: MapTick (288032) processed PlayerJoinGame peerID(1) playerIndex(4) mode(connect )
11.547 Info ServerMultiplayerManager.cpp:792: mapTick(288040) received stateChanged peerID(1) oldState(WaitingForCommandToStartSendingTickClosures) newState(InGame)
2018-01-11 08:16:34 [JOIN] hedone joined the game
612.456 Info AppManager.cpp:259: Saving to _autosave9 (blocking).
612.842 Info AppManagerStates.cpp:1541: Saving finished
817.145 ConnectionRequestReplyConfirm (type(ConnectionRequestReplyConfirm) ) from(72.174.179.110:60697)
817.145 Refusing connection for address (72.174.179.110:60697), username (Distortions864). UserVerificationMissing
817.728 ConnectionRequestReplyConfirm (type(ConnectionRequestReplyConfirm) ) from(72.174.179.110:55794)
817.728 Info ServerRouter.cpp:393: Replying to connectionRequest for address(72.174.179.110:55794).
817.728 Info ServerSynchronizer.cpp:557: nextHeartbeatSequenceNumber(23746) adding peer(2)
817.745 Info ServerMultiplayerManager.cpp:696: mapTick(336255) changing state from(InGame) to(InGameSavingMap)
817.814 Info ServerMultiplayerManager.cpp:792: mapTick(336255) received stateChanged peerID(2) oldState(Ready) newState(ConnectedWaitingForMap)
817.998 Warning TransmissionControlHelper.cpp:172: Fragment 0008 failed too many times
818.049 Warning TransmissionControlHelper.cpp:172: Fragment 0009 failed too many times
818.049 Warning TransmissionControlHelper.cpp:172: Fragment 10009 failed too many times
818.049 Warning TransmissionControlHelper.cpp:172: Fragment 20009 failed too many times
818.049 Warning TransmissionControlHelper.cpp:172: Fragment 30009 failed too many times
818.049 Warning TransmissionControlHelper.cpp:172: Fragment 40009 failed too many times
818.121 Info ServerMultiplayerManager.cpp:852: MapTick(336255) Serving map(/home/fact/fact-a/temp/mp-save-1.zip) for peer(2) size(5209142) crc(1382884137)
818.121 Info ServerMultiplayerManager.cpp:696: mapTick(336255) changing state from(InGameSavingMap) to(InGame)
818.240 Info ServerMultiplayerManager.cpp:792: mapTick(336262) received stateChanged peerID(2) oldState(ConnectedWaitingForMap) newState(ConnectedDownloadingMap)
819.982 Info ServerMultiplayerManager.cpp:792: mapTick(336366) received stateChanged peerID(2) oldState(ConnectedDownloadingMap) newState(ConnectedLoadingMap)
820.256 Info ServerMultiplayerManager.cpp:792: mapTick(336383) received stateChanged peerID(2) oldState(ConnectedLoadingMap) newState(TryingToCatchUp)
820.461 Info ServerMultiplayerManager.cpp:792: mapTick(336395) received stateChanged peerID(2) oldState(TryingToCatchUp) newState(WaitingForCommandToStartSendingTickClosures)
820.461 Info GameActionHandler.cpp:3371: MapTick (336395) processed PlayerJoinGame peerID(2) playerIndex(0) mode(connect )
820.547 Info ServerMultiplayerManager.cpp:792: mapTick(336400) received stateChanged peerID(2) oldState(WaitingForCommandToStartSendingTickClosures) newState(InGame)
2018-01-11 08:30:03 [JOIN] Distortions864 joined the game
890.132 Error ServerMultiplayerManager.cpp:95: MultiplayerManager failed: multiplayer.invalid-address("pingpong1.factorio.com:34197", "Temporary failure in name resolution")
890.132 Info ServerMultiplayerManager.cpp:696: mapTick(340575) changing state from(InGame) to(Failed)
890.132 Info NetworkInputListener.cpp:45: Refusing Input Action [0 65535 CheckCRCHeuristic] because multiplayer control is not ready
890.133 Info GlobalContext.cpp:671: Waiting for child processes to exit:
890.428 Info ServerMultiplayerManager.cpp:141: Quitting multiplayer connection.
890.428 Info ServerMultiplayerManager.cpp:696: mapTick(4294967295) changing state from(Failed) to(Closed)
890.428 Info HttpSharedState.cpp:54: Downloading https://multiplayer.factorio.com/remove-game/795940
890.468 Info HttpSharedState.cpp:127: Status code: 200
890.493 Info UDPSocket.cpp:206: Closing socket
890.493 Info UDPSocket.cpp:236: Socket closed
890.493 Goodbye

Sorry or not updating. Did a internet game recently and managed to play 3 hours without error.

So for sure if it is still happening to my settings, it will be very intermittent.

I stopped using the default Ubuntu DNS cache package, and replaced it with a different package... Fixed problem.