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Re: nmap showing port 21 (ftp) open, but port is actually closed

from [Paul Day] Network Security [Permanent Link]
Subject: Re: nmap showing port 21 (ftp) open, but port is actually closed
Date: Mon, 12 Sep 2005 09:01:08 +1000 (EST) 
On Fri, 9 Sep 2005, Mike Jones wrote:

Has anyone ever seen this before, nmap is showing port 21 to be open on
a machine on the internet, but 21 is not listening on that machine.  It
happens to all machines I scan outside the local area network.


What nmap scan options were you using? By default, non-root users use the
system-supplied connect() mechanism for the TCP scanning, which I can't
see being able to false-positive. However, some of the other trickier
options could well do so.

PD

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