Tutoriale

Install and secure MariaDB on Debian or Ubuntu for AMX Mod X plugins, choose a same-host or separate-host setup, lock port 3306 to your game server, and back it up with mariadb-dump and cron.

The exact ports a CS 1.6 server uses — game, RCON, HLTV, and Steam master traffic — with copy-paste ufw and iptables rules and how to prove the port is really open.