HTTP 522 (Connection Timed Out): meaning and handling

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 522 is a Cloudflare response indicating that the connection to the origin timed out.

Previous	Next
HTTP_STATUS_SERVER_IS_DOWN	HTTP_STATUS_ORIGIN_IS_UNREACHABLE

HTTP_STATUS_CONNECTION_TIMED_OUT

The error concerns the network connection between Cloudflare and the origin, not a browser-to-Cloudflare timeout. It can result from an overloaded origin, packet loss, routing problems, or a firewall silently dropping connections.

Check origin reachability from outside the private network, connection limits, firewall rules, and TCP-level telemetry. Cloudflare identifies 52x values as origin connectivity errors in its diagnostic headers.

For a 522, Cloudflare reached the stage of trying to establish or maintain a TCP connection with the configured origin but did not receive the expected network response in time. Check origin availability, firewall allowlists, routing, and connection saturation. Browser-side changes cannot fix an origin that is unreachable from Cloudflare.

Cloudflare: 5xx errors

Looking for a different code? Search another status or error code.