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This detailed guide on LinuxBash.sh explains setting up and managing the Uncomplicated Firewall (ufw) on various Linux systems, including Ubuntu, Fedora, and openSUSE. The tutorial covers installation, enabling ufw, ensuring SSH access, and customizing firewall rules by service, port, or IP. It also provides insights into rule management, modifying or deleting rules, and configuring advanced settings like default policies and logging, making it suitable for both beginners and advanced users.