How to enable ufw on your server

If you are on Ubuntu, your in luck: it's already there, otherwise install it with "apt-get ufw".

The first and most important thing if you are only connected via SSH: Don't lock yourself out!

Before starting the firewall make sure to open the most basic standard ports for ssh, http and https and deny all the rest:

Only after this you may proceed to actually start the firewall with

Of course "disable" is the opposite and stops the firewall again. Btw: enable/disable also register ufw to be started/not be started on boot.

To activate verbose logging to /var/log/syslog, enter

You can have a look at applications that registered themselves automatically to ufw with