FTP : 530 Login authentication failed

Some of you might encounter this odd issue while trying to FTP to your server. Using the same login, you were able to login to your cPanel or SSH. But with FTP, it gives you "530 Login authentication failed".

If you are running WHM/cPanel, just run the following script.

root@localhost []# /scripts/ftpupdate
Updating ftp passwords for all users
Ftp password files updated.
Ftp vhost passwords synced