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

[Mordread Wallas <mordread.wallas () gmail com>]

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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