Firewall
Firewalld firewall
A quick manual for installing and managing the Firewalld firewall on Debian and Fedora systems, geared towards desktop computers. It explains how to enable the daemon, assign secure network zones, and open specific ports for common services like Samba or KDE Connect.
UFW Firewall for a Raspberry Pi Server
A practical tutorial on hardening the security of your Raspberry Pi server using UFW (Uncomplicated Firewall). Discover how to set default policies, configure traffic filtering rules, open only the strictly necessary ports for your services, and protect the system against unauthorized access effectively.