How To Set Up a Firewall with UFW on Ubuntu 14.04?:
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-14-04
Some UFW command:
sudo apt-get install ufw [install]
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow ssh
sudo ufw allow 22 [or your ssh port]
sudo ufw allow http
sudo ufw allow https
sudo ufw allow [port for your web admin!]
sudo ufw allow ftp
sudo ufw deny ftp
sudo ufw allow 22
sudo ufw deny 22
sudo ufw disable
sudo ufw status verbose
sudo ufw enable