1) Set a very strong password, keep it in your mind but dont write in somewhere. 2) Disable direct root login emacs /etc/ssh/sshd_config Search for #PermitRootLogin yes Set it as PermitRootLogin no Restart ssh service sshd restart 3) Limit user login AllowUsers username Restart...
Few of very simple steps 1) Login using root 2) Enter following command to open port in iptables iptables -A INPUT -p tcp --dport 25 -j ACCEPT 3) Enter following command to close port in iptables iptables -A INPUT -p tcp --dport 25 -j DROP 4) Save iptables service iptables save OR...
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