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Fix Windows Defender Update Error 'Permission Denied' - Remote Desktop 404 Error Fix for Admins-Windows Defender Start Error 0x800704ec Guide

Updated 2026-06-13 20:32:36developer-tools
Fix Windows Defender Update Error 'Permission Denied' - Remote Desktop 404 Error Fix for Admins-Windows Defender Start Error 0x800704ec Guide
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.