Practical Linux Security Cookbook - Second Edition

How to do it...

First, we will see how to disable SSH root login and then we will also see how to enable it again:

1. First, open the main configuration file of SSH, /etc/ssh/sshd_config, in any editor:

    sudo nano /etc/ssh/sshd_config

2. Now look for the line that reads as follows:

    PermitRootLogin yes

3. Change the value yes to no. Then save and close the file:

    PermitRootLogin no

4. Once done, restart the SSH daemon service using the following command:

5. Now let's try to log in as root. We should get an error:

"Permission Denied" 

This is because ...