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Fix PowerShell Proxy Error 407: Authentication Required - Fix Windows Defender Error 0x800704ec-Windows Defender Not Starting After Fresh Install? Fix It

Updated 2026-06-15 20:08:46macos-help
Fix PowerShell Proxy Error 407: Authentication Required - Fix Windows Defender Error 0x800704ec-Windows Defender Not Starting After Fresh Install? Fix It
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.