522 5xx Cloudflare custom

Connection Timed Out

Cloudflare-specific. Connection to origin timed out (TCP-level).

What HTTP 522 means

Cloudflare 522: Cloudflare couldn't establish a TCP connection to origin within the timeout. Origin overloaded, network ACL blocking Cloudflare, or origin geographically distant from Cloudflare's edge.

Typical causes

Origin overloaded
Network ACL blocking Cloudflare
Origin behind slow link