Invite friends through the in-game lobby; the game will treat the virtual network as a direct LAN connection. 3. General Connectivity Troubleshooting (NAT & Firewall)
Open the Start menu, type , and select it. Click Change settings (requires administrator privileges). Locate Anno 1800 and Ubisoft Connect in the list.
Instead of looking for a lobby, have the host send a direct invite through the "Friends" list before the game starts. Quick Checklist for a Stable Game Verify game files on all PCs. Sync Windows time settings. Disable VPNs (unless using Radmin for LAN). Close Chrome or high-bandwidth apps. If you’re still seeing issues, let me know: Are you getting a specific error code (like LR40 or CF04)? anno 1800 lan multiplayer fixed
The Windows Defender Firewall frequently blocks Anno 1800 inbound and outbound traffic. You must manually create explicit rules for the game executable and the Ubisoft Connect launcher. Add Firewall Exceptions Press Win + R , type control firewall.cpl , and hit .
Elena zoomed in on a baker’s stall. The animation was fluid. The NPCs were walking without teleporting. "It’s fixed," she whispered. "It’s actually fixed." Invite friends through the in-game lobby; the game
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.
"Do it," Elena said, sacrificing her last shred of patience. "Or I’m uninstalling and we’re playing Solitaire." Click Change settings (requires administrator privileges)
If you are in the same building but still having trouble, or if you want to play without a reliable internet connection, using a Virtual Private Network (VPN) or LAN emulator is the best approach. Use Hamachi, Radmin VPN, or ZeroTier. Method:
The fixes available involve simulating a local network environment so that Ubisoft Connect believes you are on a fast, stable connection, or bypassing the need for constant, high-speed authentication. Method 1: The "Online-Local" Method (Recommended)
However, based on community discussions (Reddit, Steam, Ubisoft forums), here is a of what “fixing” LAN multiplayer in Anno 1800 actually means — and how players have made it work: