Listing 1. The standard nmap port-scanning tool provides another
confirmation that your site and all ports are completely closed to the
world.

$ nmap -v -A your.site.url

Starting Nmap 4.75 ( http://nmap.org ) at 2009-10-03 12:59 UYT
Initiating Ping Scan at 12:59
Scanning 190.64.105.104 [1 port]
Completed Ping Scan at 12:59, 0.00s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 12:59
Completed Parallel DNS resolution of 1 host. at 12:59, 0.01s elapsed
Initiating Connect Scan at 12:59
Scanning r190-64-105-104.dialup.adsl.anteldata.net.uy (190.64.105.104)
 [1000 ports]
Completed Connect Scan at 12:59, 2.76s elapsed (1000 total ports)
Initiating Service scan at 12:59
SCRIPT ENGINE: Initiating script scanning.
Host r190-64-105-104.dialup.adsl.anteldata.net.uy (190.64.105.104)
 appears to be up ... good.
All 1000 scanned ports on r190-64-105-104.dialup.adsl.anteldata.net.uy
 (190.64.105.104) are closed

Read data files from: /usr/share/nmap
Service detection performed. Please report any incorrect results
 at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 2.94 seconds