Anno 1800 Lan Multiplayer Fixed File

does not have a dedicated "Offline LAN" button, you can play in a LAN-like environment by hosting a custom multiplayer session, though an active internet connection is typically required for the initial handshake via Ubisoft Connect.

Recent updates have addressed long-standing multiplayer stability issues that players often encountered in local or online play: Recent Multiplayer Fixes & Stability

Desync Hotfix (November 2025): A major update was released to resolve severe desync issues on PC. This fix stabilized sessions that previously crashed every few hours.

Mod Compatibility: Game Update 18 and subsequent patches fixed issues where differing mod setups caused matchmaking failures and immediate desyncs.

Save File Loading: A recurring bug where multiplayer saves failed to load has been mitigated. A common community fix involves having the host load the save solo first, creating a fresh save, and then re-inviting players to a new lobby. How to Set Up a "LAN" Session Game Updates | Anno 1800 Wiki | Fandom

Here’s a draft for a forum or Steam Community post regarding the LAN multiplayer fix for Anno 1800.

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.

[GUIDE] Anno 1800 – LAN Multiplayer: How to get it working (2026 fix) anno 1800 lan multiplayer fixed

Platform: PC (Ubisoft Connect / Steam)
Game version: As of April 2026

If you’ve tried playing Anno 1800 over LAN recently, you know the pain:

“Connection failed”
Endless “Waiting for player…”
Games not showing up on the local network

Good news – it is possible to fix LAN multiplayer without modding core game files. Here’s what actually works right now.

2. ZeroTier + Batch Script (DIY Fix)

For those who want LAN over the internet (virtual LAN for remote friends) or have complex network setups (VLANs, multiple switches), the ZeroTier method remains robust:

Create a ZeroTier virtual network.
Use a batch script to force Anno 1800 to bind to the ZeroTier IP address.
Host uses netsh portproxy to forward traffic.

This isn’t a “fix” for local LAN per se, but it transforms any network into a LAN—perfect for dorm or office play where IT restrictions block local discovery.

Step 4: Adjust Antivirus Software Settings

Disable Antivirus: Temporarily disable your antivirus software to ensure it's not blocking the game's network traffic.
Add Game Exception: Add ANNO 1800 to your antivirus software's exception list to prevent it from blocking the game's network traffic.

What Ubisoft should actually fix

Restore legacy LAN broadcast discovery
Remove mandatory relay for same-subnet connections

Until then, the Direct IP + offline launch method works 95% as well as real LAN.

Questions? Reply below. I’ll update this post if a future patch breaks it again. does not have a dedicated "Offline LAN" button,

The Evolution and Resolution of Multiplayer Challenges in Anno 1800 For many fans of the grand city-building franchise,

represents the pinnacle of industrial-era strategy. However, since its launch, the multiplayer experience—specifically for those seeking the stability of Local Area Network (LAN) or consistent online sessions—has been a journey of technical hurdles and community-driven workarounds. The Desire for LAN and the "Online-Only" Reality

Historically, the Anno series thrived on local play, but Anno 1800 fundamentally lacks a native, offline LAN mode. This design choice by Ubisoft forced all players through their online servers, making the experience dependent on the stability of Ubisoft Connect. Players have noted that if internet connectivity fails, the multiplayer option typically becomes unavailable, effectively ending any "local" sessions that aren't routed through the cloud. Common Fixes for Multiplayer Connectivity

To "fix" or stabilize the multiplayer experience, seasoned players from the Anno Reddit community and Steam Discussions have identified several essential steps:

Ubisoft Connect Coordination: Rather than using Steam's internal invite system, players often find success by minimizing the game and using the "Friends and groups" tab in the Ubisoft Connect client to send direct invites.

The "Desync" Folder Refresh: A frequent issue involves "Out of Sync" errors. A known community fix involves all participating players deleting the contents of the desync folder located in the Windows user directory for Anno 1800 before restarting the session.

Firewall & Port Management: Ensuring the game is set to bypass firewalls and checking NAT settings (avoiding "Strict" NAT) remains a foundational requirement for stable connectivity. Modern Solutions and Future Outlook Multiplayer not working :: Anno 1800 Community Support [GUIDE] Anno 1800 – LAN Multiplayer: How to

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

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!

How to Manually Fix Your Anno 1800 LAN Multiplayer (Step-by-Step)

Assuming you are on the latest version (with all DLC or the base game), follow this checklist exactly. Do not skip steps.

8) Logs & deeper diagnosis

Check Anno 1800 logs: look for multiplayer/connection errors. Logs are typically in the game folder or %localappdata%.
Common log clues: port bind failures, authentication timeouts, DLC mismatch notifications.
If logs show “matchmaking” errors but ping works, the issue is likely with Ubisoft Connect services or the game’s LAN discovery.