Guides about ports
- Game servers: getting started, connecting and staying online A rented game server keeps your world online around the clock. How to size it, let players in, add mods, keep backups and fix the usual connection problems. Beginner 10 min
- 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
- 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