Here's how to change SSH port on Almalinux/RHEL to increase your server security.
Changing the SSH port is one of the important steps to take once your server is deployed.
Method #1
1. If it's the first time to change the SSH port on this system you can use the following command to change the default SSH port from 22 to 3333 for instance.
sed -i 's/#Port 22/Port 3333/g' /etc/ssh/sshd_config
Replace 3333 with the intended port number.
2. Restart sshd service
systemctl restart sshd.service
Method #2
1. Edit SSH config file with nano or your preferred editor
$ nano /etc/ssh/sshd_config
2. Press CTRL+W to search and type Port to find the line #Port 22 in the config file
3. Replace #Port 22 with Port 3333 "remove the #" (replace 3333 with a port number of your choice)
4. Press CTRL+X to exit the editor
5. Press Y and Enter to save the changes
6. Restart SSH service
$ systemctl restart sshd.service
Firewall Configuration
Check if firewalld service is running on your system.
firewall-cmd --state
If the output is running , follow the next steps:
- Add the custom port to firewalld:
firewall-cmd --permanent --add-port=3333/tcpNote: Replace 1234 with your new port number.
- Reload the firewall configurations:
firewall-cmd --reload
If you've another firewall installed like CSF, make sure to open the new SSH port on CSF.
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