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Cloudflare Error 520 (2026)

Error 520 is a Cloudflare response that indicates the origin server returned an unexpected, empty, or invalid response. In most cases, the issue is on the server side, not the user's.

🔥 Common Causes of Error 520:

- Application failure or backend server crash
- Server overload (CPU, memory, or database)
- Oversized or malformed HTTP headers
- Firewall blocking or conflicts with Cloudflare
- DNS or SSL configuration issues
- Invalid responses from the origin server

⚡️ How to Fix It Quickly:

- Refresh the page and clear your browser cache (if you're a user)
- Check server logs (Apache / Nginx / application)
- Make sure your firewall isn't blocking Cloudflare IPs
- Verify DNS records and origin server configuration
- Test the origin server directly (bypassing Cloudflare)
- Reduce the size of HTTP headers and cookies
- Check server load and available resources (CPU / RAM)

Read the full guide in our blog