Realizar un escaneo de puertos básico (nmap -F tfri.ca)
Nmap scan report for tfri.ca (72.3.171.115)
Host is up (0.044s latency).
Not shown: 98 filtered ports
PORT STATE SERVICE
80/tcp open http
443/tcp open https
Nmap done: 1 IP address (1 host up) scanned in 2.64 seconds