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If you use mods, your game in multiplayer unless:
Ubisoft’s online services still try to route LAN traffic through their relay servers. The game doesn’t reliably fall back to direct IP / local broadcast.
: Both players must have identical game versions. Use the "Verify Files" tool in Steam or Ubisoft Connect to ensure no files are corrupted. Mod Compatibility : If using mods (from platforms like ), ensure both players have the exact same versions anno 1800 lan multiplayer fixed
: For the most stable connection, ensure your NAT type is Open . Forward UDP Port 18000 in your router settings to the hosting PC.
If you are running a LAN party through a local router that connects to the internet, NAT restrictions can block peer-to-peer data packets. Enabling Universal Plug and Play (UPnP) or manually forwarding ports resolves this. If you use mods, your game in multiplayer
Corrupted temporary files can cause desyncs upon loading a saved multiplayer game. Navigate to C:\Users\[YourUsername]\Documents\Anno 1800\ . Locate and delete the accounts and cache folders.
For those who want the most reliable experience from multiple PCs in a single location, consider this advanced setup. Use the "Verify Files" tool in Steam or
Anno 1800 does not have a native "offline LAN" mode; it requires an active internet connection to authenticate via Ubisoft. If your local setup is causing conflicts: VPN Solutions : Using a virtual LAN tool like LogMeIn Hamachi Radmin VPN
To strengthen the "pseudo-LAN" connection, forward ports UDP: 18000 and TCP: 18000 in your router settings.
: Many players find that disabling IPv6 on their network adapter resolves the "unable to connect" error, especially when playing across different Windows versions.
