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Fixing 504 Gateway Timeout from Windows Update with Proxy - Windows Defender Proxy Error Fix Windows 10-Windows Security 404 Error After Update Fix

Updated 2026-06-14 06:26:43cloud-software
Fixing 504 Gateway Timeout from Windows Update with Proxy - Windows Defender Proxy Error Fix Windows 10-Windows Security 404 Error After Update Fix
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.