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Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome - Troubleshooting Cloudflare 521 Error: Port 443 Blocked-How to Solve pip Permission Denied on Linux and macOS

Updated 2026-07-28 07:49:48windows-fixes
Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome - Troubleshooting Cloudflare 521 Error: Port 443 Blocked-How to Solve pip Permission Denied on Linux and macOS
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.