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Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome Safe Mode - How to Fix Cloudflare 521 Error with Firewall Settings-How to Stop Chrome Black Screen on Second Display

Updated 2026-07-28 12:31:28macos-help
Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome Safe Mode - How to Fix Cloudflare 521 Error with Firewall Settings-How to Stop Chrome Black Screen on Second Display
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.