Many players find that disabling "Intrusion Detection" (or similar firewall settings) in their router’s web interface immediately restores access.

Open the and navigate to Network and Internet > Network and Sharing Center . Click on Change adapter settings in the left-hand menu.

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.

If you're trying to join a modded server, having the wrong version of a car or track mod is a very common cause of connection issues. Every client must have the exact same version of the mod to connect. If the server updates its mods, you must update yours, too.