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Fix Windows Defender Update Error 0x80070643 - Troubleshooting 'Connection Refused Port 80' in Windows-Fix Windows Search Permission Denied in Windows 11

Updated 2026-06-13 20:20:24developer-tools
Fix Windows Defender Update Error 0x80070643 - Troubleshooting 'Connection Refused Port 80' in Windows-Fix Windows Search Permission Denied in Windows 11
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.