How to change your SSH port

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Please follow the steps listed below as-is

nano /etc/ssh/sshd_config

Find, the line line which states 'Port 22'. Make sure that you pick a port which is currently not used on the system.

Change it to reflect the following and replace with your desired SSH port.

Port <SSH port Here>

Save the file and then,

service sshd restart

Next time you wish to SSH into your VPS/Server you'll have to select the port you set it to,

ssh username@hostname.com -p <SSH port Here>

Updating your firewall config

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You can change the number "22" in the commands listed below to the new port you've set above and then run the command.

For UFW Firewall

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Used primarily on Ubuntu based systems

 ufw allow 22

firewalld

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firewalld is primarily used on CentOS 7

 firewall-cmd --zone=public --add-port=22/tcp --permanent
 firewall-cmd --reload

For iptables

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Most commonly used firewall on most systems (CentOS 6, Debian)

iptables -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
service iptables save
service iptables reload