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Fix PowerShell 504 Gateway Timeout on Windows Server - Windows 10 Defender Connection Refused Error Troubleshooting-Fix Firefox Profile Missing Error 0x80520007

Updated 2026-06-14 11:59:41developer-tools
Fix PowerShell 504 Gateway Timeout on Windows Server - Windows 10 Defender Connection Refused Error Troubleshooting-Fix Firefox Profile Missing Error 0x80520007
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.