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How to Fix Firefox Secure Connection Failed Error - Fix Port Conflicts with Command Prompt-Windows Defender File Locked: Troubleshooting Steps

Updated 2026-06-13 20:22:43browser-issues
How to Fix Firefox Secure Connection Failed Error - Fix Port Conflicts with Command Prompt-Windows Defender File Locked: Troubleshooting Steps
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.