Error: Login without a password is forbidden by configuration (see AllowNoPassword)
This error occurs because phpMyAdmin is normally configured to disable passwordless login due to security reasons.
Solution for this to set the AllowNoPassword variable, located in phpMyAdmin’s configuration file, to TRUE. On an Ubuntu 15.04 server edit the following file:
vim /etc/phpmyadmin/config.inc.php
Find the line:
// $cfg[‘Servers’][$i][‘AllowNoPassword’] = TRUE;
Uncomment that line; you’ll remove the //.