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Fixing Cloudflare 521 Error: Enable Origin Pull Setup - How to Fix an Nginx Redirect Loop: Step-by-Step-Nginx Permission Denied Error Log Location and Fix

Updated 2026-07-28 15:00:44office-tools

Fixing Cloudflare 521 Error: Enable Origin Pull Setup - How to Fix an Nginx Redirect Loop: Step-by-Step-Nginx Permission Denied Error Log Location and Fix

Likely symptom

Likely cause

Safe rollback

Verification route

Repeat the original action, not only a simplified test case.
Restart the app or reload the service after configuration changes.