Guides about firewall
- Set up a firewall with UFW on Ubuntu and Debian UFW is the simplest way to run a deny-by-default firewall on Ubuntu and Debian. Set it up in the right order so you never lock yourself out. Beginner 15 min
- Build a server firewall with nftables nftables is the Linux firewall framework that Debian uses by default. One readable file describes the whole firewall for IPv4 and IPv6. Intermediate 20 min
- Locked out after a firewall change: how to get back in A firewall rule or a port change can cut your own connection. Use the console to undo it, then apply firewall changes with a safety net. Intermediate 10 min