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RE: nmap showing port 21 (ftp) open, but port is actually closed
From: "Drage, Nick" <nick.drage () eds com>
Date: Fri, 16 Sep 2005 12:43:58 +0100

Is it 'closed' or firewalled?  A firewalled port will show as 
filtered since it will not receive the response reporting that 
it is closed.
Therefore, it cannot be distinguished between open/filtered.

I presume that you're referring to UDP scans, whereas for this FTP
related issue its likely that TCP is being used.  If not please explain,
because I'm missing something if that's the case.

Nick Drage
EDS UK Penetration Testing Team

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