I followed this tut http://www.trainsignal.com/blog/how-to-set-up-safe-ftp-in-linux to setup an ftp server with user account

sudo mkdir -p /home/ftp/ftpuser
sudo useradd ftpuser -d /home/ftp/ftpuser -s /bin/false
sudo passwd ftpuser

when I tried to connect with login ftpuser remotely it didn't work. It didn't work even with root UNLESS I removed root from ftpusers.

I am confused ftpusers are the users NOT allowed to do ftp ? Where are the list of users allowed then and why can't I connect with ftpuser I created ?