Your Windows Firewall or a third-party antivirus suite might be blocking the connection. This is the easiest test to see if a firewall is the issue.
Temporarily disable this option to see if it fixes the issue. Still Not Working?
, you should first check for a simple network or software mismatch . This error often occurs when your local client cannot communicate with the server due to security settings, outdated mods, or regional IP blocking. Core Solutions Your Windows Firewall or a third-party antivirus suite
If you leave the field as the default "Player," the server might fail to identify you, leading to a "Handshake Failed" error. Setting a unique name acts as an identifier, allowing the server to authenticate your connection.
Sometimes, the simplest solution is the most effective. In the in-game server browser, you might have filters enabled that are hiding the server you want to join. Still Not Working
Are you using the or Content Manager ?
Map these ports to your PC's specific local IPv4 address. Core Solutions If you leave the field as
But why does this happen, and—more importantly—how do you fix it for good?
Few things are more frustrating for a sim racer than strapping into the rig, firing up your favorite track, and being met with a sudden network barrier. The error is a common headache that boots drivers back to the lobby or prevents them from joining multiplayer races altogether.
: If the server uses DLC or custom mods (cars/tracks) that you do not have installed, it will often show as unavailable. Ensure your versions match the server's requirements.
If you are trying to a server for others to join, you will almost certainly need to set up port forwarding on your router. This is a common source of the "ERROR, INVALID SERVER, CHECK YOUR PORT FORWARDING SETTINGS" message.