Anno 1800 Lan Multiplayer Fixed

Anno 1800 requires specific network ports to be wide open to communicate effectively between local machines and Ubisoft servers. Log into your network router gateway via your web browser. Navigate to the or NAT settings tab.

Open Windows File Explorer and navigate to your user document directory: C:\Users\[YourUsername]\Documents\Anno 1800\ . Locate the folder explicitly named . Delete all files found inside this directory. 3. Bypass Steam via Ubisoft Connect Invites

The following ports should be open on your router:

Desynchronization errors (LR40 errors) trigger when the internal clocks of connected PCs differ by even a fraction of a second. anno 1800 lan multiplayer fixed

Instead of looking for a lobby, have the host send a direct invite through the "Friends" list before the game starts. Quick Checklist for a Stable Game Verify game files on all PCs. Sync Windows time settings. Disable VPNs (unless using Radmin for LAN). Close Chrome or high-bandwidth apps. If you’re still seeing issues, let me know: Are you getting a specific error code (like LR40 or CF04)?

Before diving into the fixes, it helps to understand why the game struggles with local connections.

On every PC:

The player with the strongest CPU and highest RAM capacity must host the game. The host handles all AI calculations and trading route updates.

If you can’t even get your friends into the same lobby, the issue is usually related to how communicates with your network or the game client.

I’ve written it to sound like a helpful player announcement (since Ubisoft hasn’t officially “patched” LAN back to its pre-connectivity state). If you actually have new technical steps or a community workaround, feel free to replace the bracketed details. Anno 1800 requires specific network ports to be

While Ubisoft’s patch is welcome, many hardcore LAN enthusiasts have moved beyond it. Two major community solutions now exist that “truly” fix LAN multiplayer by bypassing Ubisoft Connect entirely.

If you are in the same building but still having trouble, or if you want to play without a reliable internet connection, using a Virtual Private Network (VPN) or LAN emulator is the best approach. Use Hamachi, Radmin VPN, or ZeroTier. Method:

This is the gold standard for LAN parties. It works even without an internet connection, supports up to 8 players, and has lower RAM overhead than the official method. No desyncs reported in 2026 tests. Open Windows File Explorer and navigate to your