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Fix Windows Security Service Failed to Start Error 0x80070422 - How to Fix Microsoft Store Error 0x80073cf9-Windows 10: Port Already Allocated Error in Windows Defender Fix

Updated 2026-06-19 02:14:54office-tools
Fix Windows Security Service Failed to Start Error 0x80070422 - How to Fix Microsoft Store Error 0x80073cf9-Windows 10: Port Already Allocated Error in Windows Defender Fix
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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