How to Fix the "Server Seems to Be Unavailable" Error in Assetto Corsa
Getting hit with a "Connection Issue: The server seems to be unavailable" message right when you're ready to hit the track is a classic Assetto Corsa
. While it looks like the server is down, the problem is often a communication breakdown between your PC, your router, and the game server.
Here is a step-by-step guide to troubleshooting and fixing this common issue. 1. Check Your DNS Settings How to Fix the "Server Seems to Be
One of the most effective quick fixes involves switching to a more reliable DNS server like Google’s. Network and Internet Network and Sharing Center Change adapter settings Right-click your active connection and select Properties Internet Protocol Version 4 (TCP/IPv4) Properties Use the following DNS server addresses and enter: Preferred DNS server: Alternate DNS server: Click OK, close the windows, and restart your computer. 2. Verify Firewall and Antivirus Exceptions
Your security software might be blocking the connection between your game and the server. Ensure that assettocorsa.exe , and if you use it, Content Manager are allowed through the Windows Firewall Check that both
checkboxes are selected for these applications in your firewall settings. Checksum mismatch (car/track data altered, e
Temporarily disable your antivirus to see if it resolves the issue; if it does, add the game folder as an exception. 3. Review Port Forwarding (For Server Hosts)
If you are hosting the server yourself and others see this error, you likely need to open specific ports in your router settings. The standard ports required are 9600 (TCP/UDP) 8081 (TCP) Ensure your IPv4 address is correctly set in your router’s port forwarding rules. Some users have success enabling in the server configuration to automate this process. 4. Check for Missing DLC or Mods
Sometimes this error is a mislabeled "missing content" issue. Checksum mismatch (car/track data altered
A 2022 community survey by Sim Racing Paddock found that in 68% of “server unavailable” cases, the server was actually reachable but rejected the connection due to:
Resolution: Reinstalling the affected track/car mod or contacting server admin for ban status.
Aggressive antivirus software includes "Game Mode" or "Firewall" features that actually block peer connections. Temporarily disable your antivirus and test the server connection. If it works, add Assetto Corsa to the AV’s "whitelist" or "exclusions" list.