(Late Game)
Make sure Anno1800.exe and Ubisoft Connect are whitelisted in your Windows Firewall. anno 1800 lan multiplayer link
Enable UPnP (Universal Plug and Play) in your home router settings, or manually forward the ports required by Ubisoft Connect. 3. Check Firewall and Antivirus Permissions (Late Game) Make sure Anno1800
You can play public games fine, but when you try to join a local friend behind the same router, you cannot connect. The Solution: This is a NAT loopback issue. Routers sometimes struggle to route traffic that originates internally and is destined for the same external IP. Check Firewall and Antivirus Permissions You can play
Click the "+" icons in the lobby slots to invite friends from your Ubisoft Connect list.
| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | Game not visible in LAN browser | Broadcast packets blocked | Use Direct IP join instead | | "Connection failed" after joining | Firewall blocking UDP | Disable Windows Defender firewall temporarily to test | | Constant desyncs late game | Different DLCs or mods | Ensure all players have identical DLC activation (check in-game "Mod Browser") | | Lag despite LAN | Game using relay (high port) | Check netstat; force LAN via hosts file (Section 4) | | Cannot host at all | Teredo or IPv6 disabled | Enable Teredo: netsh interface teredo set state type=default |
Once your physical or virtual network link is established, follow these steps to launch the game: