Cloudflare Troubleshooting Guides

Cloudflare errors can surface at the worst possible moments — during deployments, under peak traffic, or in the middle of critical operations. This collection of 4 troubleshooting guides covers the most common Cloudflare issues encountered in network infrastructure, protocols, and connectivity. Each article walks through specific error messages with step-by-step diagnosis, root cause analysis, and verified solutions. Whether you're dealing with configuration problems, authentication failures, timeout errors, or unexpected behavior, these guides are designed to get you from error message to resolution as quickly as possible. Solutions are backed by official documentation and real-world production experience.

Error Quick Reference

Article	Description
How to Fix Cloudflare 502 Bad Gateway, 504 Gateway Timeout, and Connection Errors	Comprehensive SRE guide to troubleshooting Cloudflare 502, 503, 504 errors, connection timeouts, and SSL handshake failures. Actionable fixes and root causes.
How to Fix Cloudflare Error 521: Web server is down	Fix Cloudflare Error 521 'Web server is down' by verifying origin server uptime, opening port 443, and allowing Cloudflare IPs in your firewall settings.
Resolving Cloudflare Error 522: Origin Connection Timed Out	Comprehensive troubleshooting guide to fix the Cloudflare 522 Connection Timed Out error. Learn how to diagnose firewalls, server overloads, and SSL handshake f
Troubleshooting Cloudflare 502 Bad Gateway and Connection Errors	Learn how to diagnose and fix Cloudflare 502 Bad Gateway, 503 Service Unavailable, 504 Gateway Timeout, SSL handshake failures, and other connection errors.