Firewall UFW

Enhance automatically configures the Ubuntu "ufw" firewall which creates netfilter rules within the o/s kernel. The default configuration created by Enhance includes all the rules you are likely to need to manage your hosting cluster.

Unless you are an expert user, it is very important that this firewall is not disabled as it manages NAT rules which are responsible for outbound connectivity for your PHP and other application containers. If you use an external firewall, this can be used in conjunction with ufw.

You can use ufw to add any custom rules that you require. Please see the Ubuntu wiki or official documentation for more information on this.

Enhance will soon include a UI for firewall rule management.