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Fixing Cloudflare 521 Error: Enable Origin Pull Setup - Resolve Cloudflare 521 Error with DNS Fix-Fix 'Permission Denied' When Using pip in VS Code Terminal

Updated 2026-07-28 13:24:44office-tools
Fixing Cloudflare 521 Error: Enable Origin Pull Setup - Resolve Cloudflare 521 Error with DNS Fix-Fix 'Permission Denied' When Using pip in VS Code Terminal
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.