How to change SSH Port on CentOS/AlmaLinux9/RockyLinux9/RHEL 9

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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.

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 1234 "remove the #" (and replace 1234 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

$ sudo systemctl restart sshd.service

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=1234/tcp
```
Note: 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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