If you can successfully start a multiplayer match but experience frequent disconnects accompanied by an , the game engine is struggling to simulate the world at the same speed across all PCs.
, Ubisoft released a "Multiplayer Hotfix" in November 2025 to address lingering desyncs that appeared after minor system updates. Multiplayer Features
Port forwarding ensures that incoming data from other players bypasses the router's built-in security and reaches the Anno 1800 executable directly. This is particularly helpful when multiple computers are connecting from the same external IP address. anno 1800 lan multiplayer fixed
The screen went black for a heartbeat.
One player goes to Multiplayer and selects Host Custom Match . If you can successfully start a multiplayer match
Anno 1800 utilizes a strict multiplayer protocol that requires all connected clients to be perfectly synchronized. If your system clock drifts by even a few seconds, the game will trigger a desync error (LR40) and boot players from the match.
ipconfig /release ipconfig /renew ipconfig /flushdns netsh int ip reset netsh winsock reset Use code with caution. Restart your computer immediately. 5. Force IPv4 Protocol over IPv6 This is particularly helpful when multiple computers are
A small ping sound chimed through their speakers.
If missing, click and browse to your installation path: ...\Anno 1800\Bin\Win64\Anno1800.exe Create Advanced Port Rules