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Fix 'Windows Security Failed to Start Access Denied' Error - Resolve Windows Defender 502 Bad Gateway with These Steps-How to Fix Windows Defender Error 0x80070422

Updated 2026-06-13 16:10:24developer-tools
Fix 'Windows Security Failed to Start Access Denied' Error - Resolve Windows Defender 502 Bad Gateway with These Steps-How to Fix Windows Defender Error 0x80070422
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.

More repair notes

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