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Fix Firefox Secure Connection Failed Certificate Errors - Fixing SSH Connection Refused for Linux Server via PuTTY-Clear Windows Defender Cache via Command Line

2026-06-13 18:58:50browser-issues
Fix Firefox Secure Connection Failed Certificate Errors - Fixing SSH Connection Refused for Linux Server via PuTTY-Clear Windows Defender Cache via Command Line

Final checklist

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