How to change SSH server port
SSH service, by default, runs on port 22. You can change the port that your SSH service runs if you're behind a firewall that blocks the SSH default port. You can also set the port for your SSH server on a non-standard port to reduce automated attacks by bots, especially if it's directly exposed to the internet.
SSH can be configured to run on ports other than 22 by setting the Port option in the server's sshd configuration file.
Steps to change SSH server port:
Launch your preferred terminal application.
Check if the port you plan to assign to your SSH server is not already in use.
$ ss -natp | grep 2022 $
Edit sshd configuration file with your favourite text editor.
$ sudo vi /etc/ssh/sshd_config
Search for Port option and set the value to the port you desire.
Make sure the line does not begin with # as it implies the line is commented and will be ignored.
Configure firewall to allow access to the configured port (optional, if firewall is enabled).
$ sudo ufw allow 2022/tcp # Ubuntu/Debian $ sudo firewall-cmd --add-port=2022/tcp --permanent && sudo firewall-cmd --reload # CentOS / Red Hat success success
Configure selinux to allow SSH to run on the configured port (optional, if selinux is used).
$ sudo semanage port -a -t ssh_port_t -p tcp 2022
semanage can be installed on CentOS or Red Hat systems using the following command:
$ sudo yum install --assumeyes policycoreutils-python
Restart sshd service.
$ sudo systemctl restart sshd
Check if sshd is now running on the configured port.
$ ss -tlnp | grep 2022 LISTEN 0 128 *:2022 *:* LISTEN 0 128 :::2022 :::*