ipconfig /flushdns ipconfig /registerdns ipconfig /release ipconfig /renew netsh winsock reset Use code with caution. Restart your computer to apply the system network changes. Wipe Ubisoft Account Cache
Open Ubisoft Connect (installed alongside Anno 1800). Navigate to the "Friends and groups" tab and add your friend by searching for their Ubisoft nickname. This is arguably the most critical step—many connectivity issues stem from invitations failing through other platforms.
The built-in Windows firewall frequently blocks the specific ports Anno 1800 uses to sync game states between host and clients. Step-by-Step Fixes for Anno 1800 LAN Connectivity anno 1800 lan multiplayer fixed
Execute the following network commands sequentially, pressing after each line:
Disable (also known as Client Isolation or Access Point Isolation), which explicitly blocks local wireless devices from talking directly to one another. Navigate to the "Friends and groups" tab and
Minimize the game and your friend directly through the Ubisoft Connect friend list.
This open-source tool patches the game’s memory at runtime to: Step-by-Step Fixes for Anno 1800 LAN Connectivity Execute
Access your router’s admin panel and ensure is enabled. If you prefer manual port forwarding, route the following ports to your local gaming static IP addresses:
One player goes to Multiplayer and selects Host Custom Match .
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.