For fans of the industrial revolution city-builder, "Anno 1800 LAN multiplayer fixed" has become a rallying cry for those trying to enjoy stable local or online sessions. While the game technically uses a to sync game states across all PCs—meaning only user inputs are shared to keep bandwidth low—this system often leads to frustrating "desync" events.
Desyncs happen when one player’s game state stops matching the others. This often triggers an "LR40" error.
: If you hit an immediate desync when loading a save:
This meant that even if two computers were connected by the same gigabit switch, their game traffic was still routed through Ubisoft’s relay servers. The result: