Anno 1800 Lan Multiplayer Fixed

Is it perfect? Not entirely. The mode is still labeled “experimental” as of April 2026. Some users report:

But for 2-3 players on a stable local switch? It works. Latency drops from 40-60ms (via relay) to <1ms (direct). Save games are stored locally, not in the cloud.

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.

If logs show authentication failures tied to Ubisoft services, or you’ve exhausted all steps above, gather:

If you’d like, I can produce:

Which of those would you like?

If you're looking for text to use in a guide, forum post, or video to help others fix Anno 1800 LAN/Multiplayer

issues, here are a few options depending on what specifically you fixed. Option 1: The "Desync & Connection" Fix

Use this if the fix involves matching game versions, mods, or Ubisoft Connect settings.

Anno 1800 Multiplayer Fix: Resolving Connection & Desync Issues

If you're unable to join friends or keep getting "LR40" desync errors, follow these steps: Verify Game Files: Ensure everyone is on the exact same version via Ubisoft Connect Sync Your Mods: If using mods, every player must have the exact same mod folders and versions installed. The Anno Union

confirms the game will block connections if setups don't match. NAT Settings:

Check that your Windows Firewall isn't blocking Anno 1800 or Ubisoft Connect. Switching to a "Public" to "Private" network profile often helps. VPN Check:

If playing over a virtual LAN (like Hamachi or Radmin), ensure all players are on the same virtual subnet. Option 2: The "LAN via Virtual Network" Guide anno 1800 lan multiplayer fixed

Use this if you are explaining how to play "LAN" style over the internet using tools like Radmin or Hamachi. How to Play Anno 1800 over LAN (Fixed)

Anno 1800 doesn't have a native "Offline LAN" button, but you can force it using these steps: Launch Ubisoft Connect in Online Mode: The game requires an initial handshake to verify ownership. Join the Same Virtual Network:

Use a tool like Radmin VPN so all players appear on the same local network. Host a Game: Multiplayer menu , select "Host New Game." Invite via Friends List:

Even for "LAN," you typically need to invite players through the Ubisoft friends list. If the "Invite" button is greyed out, restart your Ubisoft Connect client. Option 3: Short "TL;DR" for Discord/Steam Fixed Anno 1800 Multiplayer!

Most issues are caused by mismatched mods or Ubisoft Connect being in "Offline Mode." To fix: Make sure everyone is Online in Ubisoft Connect Disable all mods to test connection. Verify files on Steam/Ubisoft.

If using a VPN/LAN tool, ensure your firewall allows the specific app ports! Key things to remember for Anno 1800 multiplayer: No Speed Controls: You cannot speed up time in multiplayer sessions. Co-op Limit:

You can have up to 16 players in total, divided into 4 factions. Crossplay:

PC players can play across Steam, Epic, and Ubisoft Connect seamlessly. Anno Union for a specific error code like LR40? DevBlog: Multiplayer and Co-op - Anno Union A: No, speed controls are limited to singleplayer. Anno Union Crossplay in Anno 1800 | Ubisoft Help

Anno 1800 supports cross-platform play between Epic, Steam, and Ubisoft Connect. Crossplay is enabled by default. Anno 1800 (PC) Co-Op Information - Co-Optimus

Anno 1800 LAN and Multiplayer connectivity issues , you generally need to address Ubisoft Connect synchronization DLC mismatches 🛠️ Essential Connectivity Fixes Check NAT Type : Ensure it is Sync Game Versions : All players must have the same version number. Verify Files : Use the Ubisoft Connect "Verify Files" tool. Disable VPNs : Virtual networks often block the game’s P2P handshake. Firewall Exceptions Anno1800.exe to your "Allowed Apps" list. 🌐 Resolving "Lost Connection" & Desyncs 1. Port Forwarding

Anno 1800 uses specific ports to maintain a stable heartbeat between players. Forward these on your router: : 18000, 18017 2. The "Invite Only" Workaround If the "Public" lobby isn't working: Start a game in Shift + F2 to open the Ubisoft Overlay. friends from your list. 3. Clear Ubisoft Cache

A bloated cache can prevent the multiplayer service from initializing: Close Ubisoft Connect. Delete the folder in the Ubisoft Connect installation directory. Restart the client as Administrator 💻 Fixes for LAN (Local Area Network) Unlike older Anno titles, Anno 1800 requires an internet connection to authenticate with Ubisoft servers, even for local play. Online Mode : Ensure all PCs are "Online" in the Ubisoft client. : Assign static internal IPs to prevent mid-game drops. DNS Settings : Switch to Google DNS ( ) if the lobby isn't appearing. 📂 Troubleshooting DLC & Mods DLC Mismatch : If the host owns a DLC that a guest doesn't, the host must disable that DLC when creating the lobby. Mod Loader : All players must have the exact same mods and the same version of the Mod Loader python35.dll ). Even one extra ornament mod will cause a desync. ⚡ Quick Specs for Stability Recommendation Connection Wired Ethernet (Avoid Wi-Fi) Background Apps Disable BitTorrent or heavy Chrome tabs Save Games

Let the host send the save file to others manually if auto-sync fails If you're still seeing the "LR40" error Is it perfect

or specific desyncs, I can help you dig deeper. To narrow it down, let me know: Are you getting a specific error code (like LR40)? Are you using Mod Manager Does the crash happen at 30 minutes

I can provide a step-by-step guide for the specific error you're facing!

doesn't have a native "LAN" button in the menu, as multiplayer is handled through Ubisoft Connect's online services. However, players frequently encounter connection issues (like error LR40) or desyncs that disrupt the experience.

As of early 2026, several hotfixes have been deployed to address these specific stability problems. Below are the steps to "fix" your local multiplayer setup and resolve common errors. 🛠️ Step 1: Solving Connection & Invitation Issues

Many "LAN" issues are actually handshake failures between Steam and Ubisoft Connect.

Avoid Steam Invites: Sending invites through Steam often leads to "Join Failed" errors. Use Ubisoft Connect Directly:

Add your friends via their Ubisoft nickname in the Ubisoft Connect app.

Minimize the game and Right-Click > Invite your friend directly through the Ubisoft Connect friend list.

Network Hardware: Perform a full power cycle on your router to clear hardware-level packet congestion. 🔄 Step 2: Fixing Desyncs (LR40 Error)

Desyncs occur when the game states between players no longer match.

The "Clean Save" Workaround: If you desync, don't just reload. Have the host load the save in Single Player, let it run for 1–2 minutes, and then save again. Invite your friends to this new save.

Verify Files: Ensure every player uses the Ubisoft Connect/Steam "Verify Files" tool. A single corrupted texture or mismatched mod file will trigger an instant desync.

Match Versions: Cross-play between PC and Console is sometimes disabled during patch windows to prevent version mismatches. 🌍 Step 3: Optimization for Local Play But for 2-3 players on a stable local switch

Even if you are in the same room, the game still pings Ubisoft's servers.

Port Forwarding: To strengthen the "pseudo-LAN" connection, forward ports UDP: 18000 and TCP: 18000 in your router settings.

Disable Background Apps: Use a "Clean Boot" to ensure other apps aren't hogging the bandwidth required for real-time synchronization. 🧩 Mod Mismatch Checklist

If you use mods, your game will not work in multiplayer unless:

Forget what the game tells you. Do not use "Internet Game."

For years, the phrase "Anno 1800 LAN multiplayer" has been enough to send a shiver down the spine of even the most patient strategy gamer.

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.

The question on everyone's lips is finally being answered: Is Anno 1800 LAN multiplayer fixed?

The short answer is mostly yes, but with specific caveats. Following the final major updates (Game Update 17 and 18) and the end of major DLC support, Ubisoft quietly patched several core networking issues. However, the game still does not have a "Classic LAN" mode. Instead, we have a functional workaround that feels like LAN.

Here is the definitive, long-form deep dive into the status of Anno 1800 LAN multiplayer, how to fix your connection tonight, and why it finally works.