A: One of you has a "Strict" NAT, the other "Open." The Strict user must apply the Teredo fix (Method 2).
in the game folder to properly trigger the online connection. Xbox App Login: You must be signed into the
FH3 relies on Teredo tunneling for Xbox Live connectivity on PC. If your Teredo state is "disabled," online play is impossible. forza horizon 3 online fix
As an older title (released in 2016), Forza Horizon 3 may have inherent limitations. The game does not support split-screen or local multiplayer—only online multiplayer is available.
Check Teredo status with:
Forza Horizon 3 (FH3) running online today, you generally need to navigate two different paths depending on whether you own the official version or are using a community "online fix." ⚙️ Official Version: Network & Connection Fixes
Forza Horizon 3 uses a technology called to tunnel IPv6 traffic through your existing IPv4 connection. This allows your PC or Xbox One to communicate with Xbox Live servers for multiplayer. However, Teredo is notoriously sensitive and can fail due to: A: One of you has a "Strict" NAT, the other "Open
A: Your Xbox privacy settings are too restrictive. Go to Xbox.com > Privacy & Online Safety > Allow "You can join multiplayer games" and "You can play with people outside of Xbox Live."
Why the online layer matters