[Solved] Desync Issues, thrice in one day. Details included.

[MonkeyDrone]

Ubuntu 14.04 LTS 64bit.
Headless Factorio server version 0.12.29
I keep getting desync issues after a couple of hours of running the server. First two times it was just me playing alone for 5+ hours
Third time with a friend, about 4 hours later desync issues, once you get a desync. That's it, game over. Restoring old autosave only lasts for a while before it is plagued with the same desync issues.

Here is the server's last words.
561.641 Info Synchronizer.cpp:444: NetworkTick(30267) peer(2) drop detection state(900/900).
561.658 Info Synchronizer.cpp:590: NetworkTick(30267) peer(2) peerHeartbeatsEmpty(false) is not responding, dropping.
561.674 Info MultiplayerManager.cpp:1473: Peer dropout for peer (1) by peer (0) -- removing now
561.674 Info MultiplayerManager.cpp:1009: networkTick(30267) mapTick(-1) removing peer(1) dropout(true)
561.674 Info Synchronizer.cpp:516: networkTick(30267) removing peer(1) success(false).
561.674 Info MultiplayerManager.cpp:1611: networkTick(30267) mapTick(-1) adding mapAlignTask(RemovePlayerAlignTask)
561.775 Info MultiplayerManager.cpp:1473: Peer dropout for peer (2) by peer (0) -- removing now
561.775 Info MultiplayerManager.cpp:1009: networkTick(30273) mapTick(-1) removing peer(2) dropout(true)
561.775 Info Synchronizer.cpp:516: networkTick(30273) removing peer(2) success(false).
561.775 Info MultiplayerManager.cpp:1611: networkTick(30273) mapTick(-1) adding mapAlignTask(RemovePlayerAlignTask)
561.775 Error MultiplayerManager.cpp:109: MultiplayerManager failed: "All other peers left / were disconnect. The map can't be downloaded."
561.775 Info MultiplayerManager.cpp:912: networkTick(30274) mapTick(-1) changing state from(DesyncedWaitingForMap) to(Failed)

Any idea whats happening?

[daniel34]

Are you using any mods? Most of the time that's the reason for multiplayer desyncs, mods that are not completely multiplayer-compatible.

[MonkeyDrone]

Found the issue, different resource variable in the mod files, i ran into a developer in irc chat. They will implement crc check for mods so this never happens again.
Mark this fixed and closed