Many modern routers and ISPs use IPv6, which Anno 1800 often struggles to negotiate during local multiplayer sessions. Disabling IPv6 is the most widely reported fix for direct connection issues between friends.
Restart your router and game to ensure that all changes take effect.
Click the "+" button under your name to invite your friend via Ubisoft Connect, not Steam, as Steam invites can be buggy.
Click . Click Change settings (requires administrator privileges). Locate Anno 1800 and Ubisoft Connect in the list. Check both Private and Public boxes for both applications. anno 1800 lan multiplayer fixed
: Have all players close the game and delete the contents of the folder, typically located under Documents/Anno 1800/ in your Windows user directory. Host-Side Save Refresh
Anno 1800 Multiplayer Fix: Resolving Connection & Desync Issues
The most important nuance for "LAN play" is how you send the invites. Many players have reported that direct invites through Steam may fail. The widely recommended fix is to use the Ubisoft Connect overlay, which acts as the central authentication hub. Many modern routers and ISPs use IPv6, which
Click the button under the "Synchronize your clock" menu.
ANNO 1800, the popular city-building and management simulation game developed by Ubisoft, has been a favorite among gamers since its release in 2019. One of the game's most exciting features is its multiplayer mode, which allows players to build and manage their cities together in a shared world. However, some players have reported issues with LAN (Local Area Network) multiplayer, which has been frustrating for those eager to play with friends and family on the same network.
I can provide a step-by-step guide for the specific error you're facing! Click the "+" button under your name to
Let the host send the save file to others manually if auto-sync fails If you're still seeing the "LR40" error
If your router blocks the specific ports used by Anno 1800 and Ubisoft Connect, players will fail to join the lobby, or the game will disconnect within minutes of launching. You must access your router's gateway configuration page to open these ports. Ports to Open for Anno 1800
Anno 1800 utilizes a strict simulation state checklist. If a single file differs between host and client, the server will reject the connection or instantly trigger a desynchronization error (LR40). Verify Game Files Open the desktop application. Navigate to the Games tab and select Anno 1800 . Click on Properties in the left-hand menu. Under Local files , click the Verify files button.
To understand the fix, you must understand the wound. Unlike Anno 1404 (Dawn of Discovery), which had a direct IP-to-IP connection, Anno 1800 uses a hybrid system. Even when two computers sit three feet apart, the game historically forced traffic through the Ubisoft Connect relay servers.