How to Fix Cloudflare 520 Error with cPanel Hosting
Posted about 2 months ago 4.6kUnderstanding Cloudflare 520 Error
Origin problem: Cloudflare received an empty or unexpected response from your server.
Common Causes
- PHP fatal error or timeout
- Empty response headers
- Server resource exhaustion
Diagnostic Steps
Bypass Cloudflare
Temporarily pause Cloudflare or edit hosts file to test direct server access.
Check cPanel Error Logs
cPanel → Metrics → Errors → Look for PHP fatal errors at the same time.
Solutions Table
| Cause | Fix |
|---|---|
| PHP crash | Increase memory_limit and max_execution_time |
| Large headers | Reduce cookies or disable unnecessary plugins |
| Resource limit | Enable caching, optimize queries |
| .htaccess issue | Rename .htaccess temporarily |