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Fixing Task Scheduler Connection Refused to SQL Server - How to Start Windows Defender Threat Service-Windows Security Blank White Screen Troubleshooting

Updated 2026-06-14 13:38:45developer-tools
Fixing Task Scheduler Connection Refused to SQL Server - How to Start Windows Defender Threat Service-Windows Security Blank White Screen Troubleshooting
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.