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Fix Windows Defender 'Cannot Connect, Permission Denied' Error - Windows Security Token Expired – Fix 0x80070520-Fix Chrome Permission Denied on Windows 10

Updated 2026-06-14 06:09:05security-tools
Fix Windows Defender 'Cannot Connect, Permission Denied' Error - Windows Security Token Expired – Fix 0x80070520-Fix Chrome Permission Denied on Windows 10
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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