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If it's normal to see 21,25 and 1863 as "filtered", then why aren't all the other ports appearing as "filtered" too!?This is my question.filtered : Nmap cannot determine whether the port is open because packet filtering prevents its probes from reaching the port.In my scenario, NMAP cannot determine whether ports 1, 2, 3, 4, 5 ,6 etc etc are open, because a packet filtering device blocks the probes, yet...we do not see all these ports listed in the output as filtered.--reason -vto your scan to see why Nmap chose each port state.filteredcan mean "no response" but it can also mean "ICMP Admin Prohibited" and a few other ICMP codes. What is on the line that starts with "Not shown:" ?