Cómo bloquear los puertos en UFW Ubuntu Firewall
// To block the UDP port 4444, run the following command:
$ sudo ufw deny 4444/udp
// The same way, you can block the TCP and UDP port (let’s say 4514) at the same time with the following command:
$ sudo ufw deny 4514
// Check status:
$ sudo ufw status
Mysterious Macaque