By default SSH service runs on port 22. Running SSH service on port 22 is not secure as it can become an easy target for attackers who are scanning the network for open ports. By changing the default port, you can make it more difficult for attackers to find and exploit the SSH service.
To change SSH port, edit file
vi /etc/ssh/sshd_config
In the file, find the line
Port 22
Change 22 to whatever port number you want. It is better to use a higher port number so it will be difficult for hackers to find.
Restart SSH service
On Debian/Ubuntu
systemctl restart ssh
On RHEL-based Linux (AlmaLinux, RockeyLinux, Oracle Linux, CentOS)
systemctl restart sshd
If you have a firewall, make sure you open the new port in the firewall.
See ssh
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