Error Codes
Understand fast.site errors 502–504 and 520–522, with checks for origin availability, firewalls, timeouts and server logs.
Bad Gateway
The edge server couldn't reach your origin server. Check that your origin is online and responding.
Solution: Verify your origin server is running and accessible. Check firewall rules.
Service Unavailable
Your origin server is temporarily overloaded or down for maintenance.
Solution: Wait a few minutes and try again. If persistent, check your origin server health.
Gateway Timeout
Your origin server took too long to respond (over 30 seconds).
Solution: Optimize slow database queries or API calls on your origin. Consider increasing timeout limits.
Unknown Error
The origin server returned an unexpected response that couldn't be processed.
Solution: Check your origin server logs for errors. Ensure responses have valid HTTP headers.
Web Server Down
The origin server refused the connection.
Solution: Ensure your web server (Apache, Nginx, etc.) is running. Check firewall settings.
Connection Timed Out
TCP connection to your origin server timed out.
Solution: Check network connectivity to your origin. Verify the origin IP is correct.
Still having issues?
If you're seeing persistent errors, our support team can help diagnose the issue.
Contact Support