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Fix 'Windows Defender Failed to Start Due to Group Policy' Error - Fix 'Port Already Allocated' Error in Windows Defender-Resolve Microsoft Store Proxy Connection Issue

2026-06-13 14:34:43developer-tools
Fix 'Windows Defender Failed to Start Due to Group Policy' Error - Fix 'Port Already Allocated' Error in Windows Defender-Resolve Microsoft Store Proxy Connection Issue

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.

More checklist guides

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