Are you playing on a or a wireless Wi-Fi setup?
: If using mods, every player must have the exact same versions and file structures. The most reliable method is for one player to zip their entire mods folder and send it to everyone else.
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.
: Invites sent through Steam are frequently reported as broken. Instead, open Ubisoft Connect , add your friends there, and invite them directly through the Ubisoft overlay (Shift+F2) or by right-clicking their name in the Ubisoft "Friends and groups" list.
While no one at Ubisoft explicitly said "We added LAN," dataminers and network engineers quickly realized what had changed. The game’s reliance on the external relay for initial handshake was reduced. The game now prioritizes a on the local subnet. anno 1800 lan multiplayer fixed
Aggressive security software often blocks the peer-to-peer data packets needed for Anno 1800 sessions.
80, 443, 13000, 13005, 13200, 14000, 14001, 14008, 14020, 14021, 14022, 14023, 14024 Anno 1800 UDP: 18000 to 18010
Open the Windows Start menu, type , and select Windows Defender Firewall .
One player goes to Multiplayer and selects Host Custom Match . Are you playing on a or a wireless Wi-Fi setup
issues, here are a few options depending on what specifically you fixed. Option 1: The "Desync & Connection" Fix
Uncheck to force the game to communicate strictly over IPv4. Double-click Internet Protocol Version 4 (TCP/IPv4) .
Check game version & updates, match network settings (firewalls, ports, UPnP), verify files, ensure consistent game/crew/season pass DLC across players, and use an offline LAN workaround (direct IP/host tool) if the in-game LAN matchmaking fails.
With the right approach, that success story can be yours too. Ubisoft’s online services still try to route LAN
These updates represent a genuine commitment from the developers to improve the multiplayer experience, even if they haven't introduced a dedicated LAN mode.
If your game is purchased through or the Ubisoft Store
Ensure your router allows traffic on UDP/TCP port 18000 , which is the official port for Anno 1800's multiplayer services. 2. Solve "Desync Detected" (LR40) and "Trajan" Errors