What it means
Cloudflare-specific: the TCP connection to the origin timed out.
Common causes
- Origin overloaded
- Network or routing issues
- Firewall silently dropping Cloudflare packets
How to fix it
As a client or visitor
Retry later.
As the site or API owner
Check server load, keep-alive settings, and that Cloudflare IP ranges are not dropped by the firewall.
Example response
HTTP/1.1
HTTP/1.1 522 Connection Timed Out
Date: Tue, 07 Oct 2025 09:30:00 GMT
Server: nginx
Content-Length: 0Specification
Not in the IANA registry; used by Cloudflare. Cloudflare
FAQ
› How long does Cloudflare wait before 522?
About 15 seconds for the TCP connection to be established.
› Does 522 mean my site is down?
It means Cloudflare could not connect; the server may be up but unreachable or overloaded.