You can ignore the Stealth Mode status reported in System Profiler. Check Security preferences' Firewall tab (Advanced button) to see if stealth mode is enabled or not.
Mac OS X v10.6: System Profiler states "Stealth Mode: No" even though stealth mode is enabled
With stealth mode enabled (in Security preferences' Firewall tab, after clicking the Advanced button), System Profiler may incorrectly report "Stealth Mode: No" in its Firewall section.
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