Guides about nftables
- 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
- Ports and port forwarding on a server, explained A port is reachable when a service listens on the right address and the firewall allows it. Check both, test from outside, and use tunnels instead of opening admin ports. Intermediate 15 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