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Fix Windows Defender Proxy Error on Windows 11 - How to Setup SSL Certificate for Windows Update-How to Fix Firefox Secure Connection Failed Certificate Error

2026-06-13 17:46:19developer-tools
Fix Windows Defender Proxy Error on Windows 11 - How to Setup SSL Certificate for Windows Update-How to Fix Firefox Secure Connection Failed Certificate Error

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.