How To Set Up a Firewall with UFW on Ubuntu 16.04 

How To Set Up a Firewall with UFW on Ubuntu 16.04 

This is a good tutorial on how to setup a firewall on Ubuntu 16.04 from DigitalOcean. Utilizing a firewall is key to preventing your server from being hacked…

sudo ufw allow

Source: How To Set Up a Firewall with UFW on Ubuntu 16.04 | DigitalOcean

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