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Fix Windows Backup and Restore Permission Denied Error - How to Fix Port Already Allocated in Windows Defender-Windows Defender Update Fails with Code 0x80070643

Updated 2026-06-13 19:26:04developer-tools
Fix Windows Backup and Restore Permission Denied Error - How to Fix Port Already Allocated in Windows Defender-Windows Defender Update Fails with Code 0x80070643
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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