Change SSH Port on Almalinux

Overview #

In this short tutorial you will learn how to change your SSH port from the default 22 to another port. This is a recommended step during any initial server hardening. Cloudfanatic’s Almalinux 9 comes with SELinux set to enforcing by default and firewalld active.

Instructions for Debian

Instructions for Ubuntu

Changing the SSH Port: #

Edit your ssh configuration file:

nano /etc/ssh/sshd_config

• Find line: #Port 22
• Uncomment the line
• Change 22 to your desired port number
• Save the file

Allow your new SSH port through SELinux #

yum -y install policycoreutils-python-utils
semanage port -a -t ssh_port_t -p tcp 12345

where 12345 is your new SSH Port.

Allow your new SSH port through firewalld #

firewall-cmd --add-port=12345/tcp --permanent
firewall-cmd --reload

Restart SSHd #

systemctl restart sshd

That should be all. Try and ssh into your server on your new port.