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Fix Windows Security Blank Screen by Resetting the App - Windows 10: Port Already Allocated Error in Windows Defender Fix-Windows Update Permission Denied Error: Step-by-Step Fix

Updated 2026-06-13 13:10:19windows-fixes
Fix Windows Security Blank Screen by Resetting the App - Windows 10: Port Already Allocated Error in Windows Defender Fix-Windows Update Permission Denied Error: Step-by-Step Fix
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.