i tried that:
>nmap -p 21 your_ip_or_domain
Starting nmap 3.45 (
http://www.insecure.org/nmap/ ) at 2003-09-22 23:51 VET
Note: Host seems down. If it is really up, but blocking our ping probes, try -P0
Nmap run completed -- 1 IP address (0 hosts up) scanned in 23.997 seconds
>nmap -P0 -p 21 your_ip_or_domain
Interesting ports on your_ip_or_domain:
WARNING! The following files exist and are readable: /home/.../share/nmap/nmap-services and ./nmap-services. I am choosing /home/.../share/nmap/nmap-services for security reasons. set NMAPDIR=. to give priority to files in your local directory
PORT STATE SERVICE
21/tcp filtered ftp
Nmap run completed -- 1 IP address (1 host up) scanned in 46.850 seconds
the port is "filtered".. What other test could i do to know more about it?
thanks!!