Click your network icon (Wi-Fi or Ethernet) in the Windows system tray. Select under your active connection. Change the Network Profile type from Public to Private .
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
Right-click your active internet connection and select .
The game offers two primary multiplayer modes:
: The Steam overlay invitation system is frequently reported as broken. Instead, add each other directly on Ubisoft Connect and invite through the in-game multiplayer lobby or the Ubisoft app. Setting Up a Match How do you best work together in coop mode? : r/anno1800 anno 1800 lan multiplayer fixed
: Ensure all players have "Set time automatically" enabled in Windows settings and click Sync now to prevent session desyncs.
Avoid Wi-Fi whenever possible. Anno 1800 simulates thousands of individual moving elements simultaneously; even a minor packet drop over Wi-Fi can trigger a desync.
In practice, up to 16 real players can join a session (as four teams of up to four players each). Regardless of how many people are in the game, the host's PC must be able to communicate with the other players' machines. This communication relies on the indicator. A "Matchmaking: Not Available" error, often accompanied by "NAT: Unknown," means a connectivity block is preventing a stable connection. This is the most common multiplayer issue users encounter.
Tip: Ensure UPnP (Universal Plug and Play) is enabled in your router settings, as this automates port configuration for most modern setups. 3. Add Windows Firewall Exceptions Click your network icon (Wi-Fi or Ethernet) in
The Windows Defender Firewall frequently blocks incoming client requests during an Anno 1800 multiplayer lobby setup.
Forget what the game tells you. Do not use "Internet Game."
Sometimes, the game tries to fall back to the internet even when you don't want it to. This forces it to stay local.
Launch both Ubisoft Connect and Anno 1800 as an administrator. Select , apply to all profiles (Domain, Private,
Click the button to align with the official time server.
If the above methods do not work, you must ensure the game has proper access through firewalls and that your NAT type is open.
Access your router configuration page via your web browser (typically 192.168.1.1 or 192.168.0.1 ). Navigate to the advanced wireless or LAN settings.