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ufw 42 firewall 30 security 12 system 11 linux 9 firewalld 9 debian 5 iptables 4 ssh 4 network 4 harden 3 ubuntu 3 csf 2 hardening 2 networking 2 netfilter 2 server 2 fail2ban 2 k8s 1 ip6tables 1 k3s 1 ipv6 1 autoupgrades 1 bootstrap 1 locale 1 galera 1 users 1 screen 1 mariadb 1 openssh 1 sshauthorizedkeys 1 mysql 1 autoupdate 1 sysctl 1 selinux 1 client 1 update 1 forward 1 deployment 1 management 1