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Fix Windows Defender Login Loop in Safe Mode - Fix Windows Update Service Permission Denied Error-Fix 'Windows Update Port Already Allocated Permission Denied'

Updated 2026-06-13 22:00:48developer-tools
Fix Windows Defender Login Loop in Safe Mode - Fix Windows Update Service Permission Denied Error-Fix 'Windows Update Port Already Allocated Permission Denied'
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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