📶Configuring SSH

Now we need to configure the SSH service by editing its configuration files.

We'll use Nano as our text editor. If you prefer VIM, you can install it using sudo apt install vim.

Editing SSH Configuration

1. Edit the SSH configuration file: We need to modify /etc/ssh/sshd_config. Since this is a system file, we need root privileges. Switch to root first:

su
nano /etc/ssh/sshd_config

1. Modify the configuration: Lines starting with # are commented out. We need to uncomment and modify the following lines:

Change the port from 22 to 4242:

Find: #Port 22 Change to: Port 4242

Disable root login via SSH:

Find: #PermitRootLogin prohibit-password Change to: PermitRootLogin no

1. Save the changes: When finished editing, save the file and exit the editor (in Nano: Ctrl+X, then Y, then Enter).

2. Now with the file /etc/ssh/ssh_config. (not sshd_config)

nano /etc/ssh/ssh_config

#Port 22 -> Port 4242

1. Finally we must restart the ssh service so it can be updated. For that purpuse we will use:

sudo service ssh restart

and once it is done we will check the service state with:

sudo service ssh status

and confirm that everything is alright.

\