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Windows Security 404 Error: Practical Troubleshooting Checklist - Troubleshoot VSCode Extension Host Termination-Proxy Misconfiguration Leading to Windows Update 504 Error

Updated 2026-06-13 18:43:09developer-tools
Windows Security 404 Error: Practical Troubleshooting Checklist - Troubleshoot VSCode Extension Host Termination-Proxy Misconfiguration Leading to Windows Update 504 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.