Press , type cmd , right-click Command Prompt , and choose Run as administrator . Type ipconfig /flushdns and press Enter . Type netsh winsock reset and press Enter . Restart your computer. 4. Adjust Steam and Content Manager Plugins
For users running their own dedicated server OR those who still see "Server Unavailable" despite the above steps. Press , type cmd , right-click Command Prompt
Click on the left panel. Click Change settings (requires administrator privileges). Scroll down to locate Assetto Corsa and Content Manager . Restart your computer
Incompatible internal plugins or Steam configurations frequently trigger handshake failures with online servers. Click on the left panel
Look for a security setting called or Firewall Level .
On Win11, AC sometimes routes through the Xbox Networking stack.
An incorrect system clock can break secure network connections to game servers.