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
. Most players now report a "flawless" or "smooth" experience in sessions lasting several hours. Mandatory Online Check
TCP: 80, 443, 13000, 13005, 13200, 14000, 14001, 14020, 14021, 14022, 14023, 14024 Anno 1800 Game Ports: UDP: 18000 anno 1800 lan multiplayer fixed
Before diving into fixes, it's crucial to understand how the game's multiplayer actually works. Anno 1800 uses a rather than a traditional LAN mode. This means that even if everyone is in the same house, the game requires an internet connection to authenticate through Ubisoft's servers. True, system-link LAN, as you might find in older titles, is not supported .
The game's cross-platform multiplayer system is designed to support up to 16 players across PC, PlayStation, and Xbox, handling invitations, lobby creation, and game synchronization through Ubisoft's online infrastructure. While PC players from Steam, Epic Games Store, and Ubisoft Connect can all play together without issue—since all multiplayer services run through Ubisoft Connect regardless of where you bought the game—this architecture means there's no native "direct connection" option that bypasses the internet entirely. Anno 1800 does not have a native "offline
If you use software like Hamachi, R控制 (Rant), VirtualBox, or corporate VPNs, Windows might route Anno 1800 traffic through a dead virtual adapter instead of your physical Ethernet cable. Press Win + R , type ncpa.cpl , and click .
Close the game, go to the Ubisoft Connect install folder, and delete the cache folder. This often clears "invisible" lobby bugs. Mandatory Online Check TCP: 80, 443, 13000, 13005,
Mastering Anno 1800 LAN Multiplayer: How to Fix Connectivity Issues permanently
However, cross-play between PC and consoles is handled differently. While recent patches have enabled cross-play between PC and PlayStation 5, Xbox Series X|S support followed shortly after in mid-December 2025. Console players should ensure they've installed the latest updates to maintain compatibility.