>Keep in mind that if grc's scanner can see a stealth'd port, that means
>more advanced tools can see it as well.  If a port is closed, then all
>that means is that it is closed and will NOT respond to requests on >that 
>port.

That isn't correct.  A closed port responds saying that the port is closed 
(as in no services are being offered on that port, and it isn't expecting 
any data).  A stealth port doesn't respond at all and is indicative of a 
fully firewalled computer, or that there isn't a host at that address at 
all.  Thus GRC's scanner can't actually see a stealthed port - the results 
would be the same if you turned off your computer.

S



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