Host Firewall Basics
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Host Firewall Installation and Configuration
It is recommended to use a simple host firewall and deny any incoming connections on all ports. gufw provides a simple graphical user interface for the Uncomplicated Firewall program.  It is easy to perform common tasks like blocking or allowing P2P, individual, or pre-configured ports.
How-to: Install and Configure a Firewall
The following steps install gufw on a Debian host.
1. Install gufw.
sudo apt update && sudo apt install gufw
2. Start gufw.
Unlock. Enter the password.
5. Check the settings.
By default, the settings should be
Incoming: Deny and
Although not recommended, it is possible to add special firewall rules, use pre-configured options for common programs and services, or set other advanced options in gufw by following this guide.
For further information on firewalls, see here.