Look up an error
Paste a code like 522 or 1015, or describe what's happening, and get a likely cause with a fix.
Browse all error codes
- 1015: You are being rate limited
- 1016: Origin DNS error
- 1020: Access denied
- 400: Bad Request
- 401: Unauthorized
- 403: Forbidden
- 404: Not Found
- 405: Method Not Allowed
- 429: Too Many Requests
- 500: Internal Server Error
- 502: Bad Gateway
- 503: Service Unavailable
- 504: Gateway Timeout
- 520: Web server returns an unknown error
- 521: Web server is down
- 522: Connection timed out
- 523: Origin is unreachable
- 524: A timeout occurred
- 525: SSL handshake failed
- 526: Invalid SSL certificate
- 530: Shown alongside a 1xxx error
- Your bot protection challenged our scan
- We couldn't connect to this host
- This domain doesn't resolve
- Server error, likely not from Cloudflare's edge
- Redirect points to a private or internal address
- This site is stuck in a redirect loop
- TLS/SSL negotiation failed