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Fix Windows Defender Error 502 Bad Gateway - Fix 'Access Denied' in Windows Search on Windows 11-Real-Time Protection Not Turning On Windows 10/11

Updated 2026-06-13 16:49:26office-tools
Fix Windows Defender Error 502 Bad Gateway - Fix 'Access Denied' in Windows Search on Windows 11-Real-Time Protection Not Turning On Windows 10/11
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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