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Fix Windows Terminal 404 Not Found After Update - Fix Defender Service Fails to Start on Windows 10/11-Fix 'Windows Update Port Already Allocated Permission Denied'

Updated 2026-06-13 21:42:42windows-fixes
Fix Windows Terminal 404 Not Found After Update - Fix Defender Service Fails to Start on Windows 10/11-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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