Are you playing via a or an online LAN/VPN setup (like Hamachi)?
If you bought the game on Steam, do not rely on the Steam overlay for invites. Use the in-game Friends List (Shift+F2) within the Ubisoft Connect overlay to send invites. anno 1800 lan multiplayer fixed
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. Are you playing via a or an online
When a LAN multiplayer game crashes or desyncs, loading the save file incorrectly can permanently corrupt the lobby state. Follow this exact workflow to resume your session smoothly: Many modern routers and ISPs use IPv6, which
A major patch (1.3) released in December 2025 addressed several critical issues that plagued multiplayer sessions:
Select , apply to all profiles (Domain, Private, Public), and name it "Anno 1800 TCP". Repeat the entire process for UDP ports: 6015 . 2. Harmonize Game Versions and Modifications