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sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
sudo iptables -A INPUT -j DROP

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sudo apt-get update
sudo apt-get upgrade

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sudo service --status-all
sudo service [service_name] stop
sudo update-rc.d -f [service_name] remove

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sudo vi /etc/login.defs

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PASS_MAX_DAYS 90

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sudo passwd [username]

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ssh-keygen

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cat ~/.ssh/id_rsa.pub | ssh [username]@[server_address] "cat >> ~/.ssh/authorized_keys"

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sudo chmod 750 [directory_name]

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