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Fix Nginx 'upstream connection refused' When Talking to PHP-FPM - Fix 521 Error with Cloudflare Origin Pull Configuration-Nginx HTTP to HTTPS Loop: Causes and Solutions

2026-07-29 04:01:41database-tools
Fix Nginx 'upstream connection refused' When Talking to PHP-FPM - Fix 521 Error with Cloudflare Origin Pull Configuration-Nginx HTTP to HTTPS Loop: Causes and Solutions

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.

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