The origin responds to some tests while connections from Cloudflare time out.
Likely causes
- Cloudflare IP ranges filtered
- Intermittent saturation
- Asymmetric routing
- Connection limit reached
Checks in priority order
- Check firewall logs at the 522 timestamp
- Measure load and connection counts
- Verify origin DNS
- Compare direct access with Cloudflare access
When to escalate
Escalate when the failure affects multiple users, a production dependency is unavailable, or logs show a component outside your control. Include timestamps, scope, tests already performed, and the last known working state.