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If you are on a University campus or corporate housing where the LAN is segmented (Broadcast traffic blocked), the "fix" won't work. Use ZeroTier or Radmin VPN.
Anno 1800’s LAN multiplayer can be unreliable or broken for some players — this guide walks you through causes, fixes, and preventative tips so you can get stable local multiplayer sessions with friends. Use the checklist and troubleshooting steps below in order; try the quick fixes first, then follow deeper troubleshooting if problems persist.
This open-source tool patches the game’s memory at runtime to:
How to use:
Verdict: 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.
Ubisoft’s online services still try to route LAN traffic through their relay servers. The game doesn’t reliably fall back to direct IP / local broadcast.
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.
This caused three specific failures: