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Evil Port Monitors will tell you that a passing scanner has just successfully probed into your system . . . but the problem (for you) is that it was a successful scan probe and the existence of your system's wide open ports will have been noticed and logged! Port Scanning Attacks - Anti-Virus, Anti-Malware, and Nov 27, 2010 why won't command prompt stay open when trying to run Apr 30, 2011 I have another Shields Up question.. - July 2008 - Forums
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So, next I tried to telnet into the Leopard machine and the connection was always refused. Thankfully! So, unless you specifically opened up port 23, I doubt that it is actually open and I would doubt that 53 is open either. From the tests that I made, I would question whether Shields UP! is giving you valid results.
After running the "All Service Ports" probe test a few times, I keep getting differing results. Before upgrading to McAfee Security Center 2013 (I had the 2011 edition before), all ports were in stealth mode, but now sometimes ports 135, 139 and 445 are "closed" instead. Each time a different port i
Aug 28, 2003 "Shields UP! Leopard Firewall Test … - Apple Community