Not able to login to FTP accounts using root password

Issue :

Was able to login to all FTP accounts using the root password earlier but now it doesn’t seem to work. Where to check that?

Fix :

Go to WHM >> Main >> Service Configuration >> FTP Server Configuration.
At the bottom of the page, you’ll find an option as ‘Allow Logins with Root Password’
Make sure that it is set to ‘Yes’ and save the settings.

This should resolve the issue.