Open the Windows Start menu, type , and select Windows Defender Firewall .
Download and install Radmin VPN on all participating computers.
Anno 1800 is a masterpiece of city-building and economic management, offering a deep, immersive experience that is even better with friends. However, players looking to host a true Local Area Network (LAN) party often find that the game’s reliance on Ubisoft Connect online services makes direct, offline, or low-latency local multiplayer frustratingly difficult to set up.
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Visit your motherboard manufacturer's website to ensure your LAN/Wi-Fi drivers are up-to-date. Summary Checklist to Fix Anno 1800 LAN Disable IPv6 on Ethernet/Wi-Fi. Verify Game Files in Ubisoft Connect. Use Radmin VPN or Hamachi if direct connection fails. Ensure both users are running the same game version .
The player with the weakest PC hardware dictates the simulation speed. If their system drops frames or lags during massive late-game industrializations, it will cause an LR40 desync. Lowering graphical settings on slower machines fixes this.
Ubisoft’s masterpiece of logistics and city-building is beloved by millions, but for those trying to play over a Local Area Network (LAN)—whether at a LAN party, between two PCs in the same house, or via VPN services like Hamachi or ZeroTier—the experience has historically been plagued with desync errors, connection drops, and the dreaded "Failed to join session" message. Open the Windows Start menu, type , and
| Error Code | Meaning | The LAN Fix | | :--- | :--- | :--- | | | Relay server timeout | Switch to Direct Connection . The host is trying to use Ubisoft servers. | | Desync (CTD) | Packet loss | Check your Ethernet cables. Disable WiFi on both PCs if hardwired. | | "Unable to join" | Port 18000 blocked | Manually forward ports OR disable Windows Defender entirely for 5 mins to test. | | Endless Loading | IPv6 conflict | Disable IPv6 on your Network Adapter properties. Force IPv4. |
Set your network adapter priority to prioritize the VPN software. Launch Anno 1800 via Ubisoft Connect.
Open and navigate to Network and Internet > Network and Sharing Center . However, players looking to host a true Local
A small ping sound chimed through their speakers.
To understand the fix, you must understand the wound. Unlike Anno 1404 (Dawn of Discovery), which had a direct IP-to-IP connection, Anno 1800 uses a hybrid system. Even when two computers sit three feet apart, the game historically forced traffic through the Ubisoft Connect relay servers.
is allowed through the Windows Firewall for both Public and Private networks. Troubleshooting Desyncs & Mods
Like many modern PC games, Anno 1800 does not include a traditional "direct IP" LAN mode that works entirely offline. The game's multiplayer functionality runs through Ubisoft Connect (formerly Uplay), requiring an active internet connection and friend invites to join games, even when all players are connected to the same router. However, players have discovered a range of configuration tricks, network adjustments, and launcher-based workarounds that effectively create a "LAN-like" experience in the game.