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

from [Mordread Wallas] Network Security [Permanent Link]
Subject: Re: nmap showing port 21 (ftp) open, but port is actually closed
Date: Sun, 11 Sep 2005 21:46:02 +0200 
2005/9/9, Mike Jones <sopiaz57@gmail.com>:

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.

Thanks in advance


Dear Mike,

You may have a firewall running between you and these computers. 
Firewalls often make port 21 appears to be opened.

Best regards,
Mordread

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