Unofficial HTTP status codes used by CloudFlare

Code Text Description
520 Unknown Error A generic response when the origin server returns something unexpected
521 Web Server Is Down The origin server is refusing connections from CloudFlare
522 Connection Timed Out A TCP handshake cannot be negotiated with the origin server
523 Origin Is Unreachable CloudFlare can't reach the origin server (e.g. because of a DNS error)
524 A Timeout Occurred A TCP connection to the origin server was completed, but a response wasn't received in time
525 SSL Handshake Failed A SSL/TLS handshake couldn't be negotiated with the origin server
526 Invalid SSL Certificate The SSL/TSL certificate presented by the origin server couldn't be validated
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