Log in as root (su - root) on the control plane server.
Edit the file /etc/default/login.
Locate the line that contains the text string CONSOLE=/dev/console.
If the line is commented out, remove the comment symbol #.
Make certain the /etc/default/login file contains only one CONSOLE=/dev/console line.
Save and close the file.
For more information, see the login(1) man page.