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ufw 42 firewall 30 security 12 system 11 linux 9 firewalld 9 debian 5 network 4 ssh 4 iptables 4 harden 3 ubuntu 3 hardening 2 networking 2 netfilter 2 server 2 fail2ban 2 csf 2 client 1 forward 1 update 1 deployment 1 management 1 install 1 sshguard 1 windowsfirewall 1 base 1 routing 1 web 1 nat 1 vps 1 admin 1 sshd 1 docker 1 initialsetup 1 k8s 1 ip6tables 1 k3s 1 ipv6 1 galera 1