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Fixing 504 Gateway Timeout from Windows Update with Proxy - Windows Update Service Auto Start Failure Fix-How to Resolve Windows Defender SSL Sync Error

Updated 2026-06-14 01:16:04macos-help
Fixing 504 Gateway Timeout from Windows Update with Proxy - Windows Update Service Auto Start Failure Fix-How to Resolve Windows Defender SSL Sync Error
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.