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Fixing Nginx Permission Denied Error (Code 13) - Fix Cloudflare Error 521 on Apache Server-Fix Windows Defender Can't Connect to Internet Error

Updated 2026-06-13 15:16:37cloud-software
Fixing Nginx Permission Denied Error (Code 13) - Fix Cloudflare Error 521 on Apache Server-Fix Windows Defender Can't Connect to Internet Error
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.