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Windows Defender Connection Refused: Troubleshooting Checklist - Go Proxy 'No Such Host' Error Fix-Fix Windows Security Error 404 After Update

2026-06-13 18:22:40cloud-software
Windows Defender Connection Refused: Troubleshooting Checklist - Go Proxy 'No Such Host' Error Fix-Fix Windows Security Error 404 After Update

Final checklist

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