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ufw 42 firewall 30 security 12 system 11 firewalld 9 linux 9 debian 5 iptables 4 ssh 4 network 4 ubuntu 3 harden 3 fail2ban 2 csf 2 hardening 2 networking 2 netfilter 2 server 2 routing 1 vps 1 web 1 nat 1 admin 1 sshd 1 initialsetup 1 docker 1 ip6tables 1 k8s 1 ipv6 1 k3s 1 bootstrap 1 locale 1 galera 1 autoupgrades 1 users 1 screen 1 mariadb 1 openssh 1 sshauthorizedkeys 1 mysql 1