I'm using phpMyAdmin on CentOS v6. Configured it to authentication type: cookie, I set username and password. (in /etc/phpMyAdmin/config.inc.php)
When I browse to http ://my-server/phpMyAdmin/ I get a web login form, I entered the username and password that I worte in the configuration file but it tells:
#1045 Cannot log in to the MySQL server
I looked after the following guide: http://ifzenelse.net/en/install-and-configure-phpmyadmin-centos
There was a conflict: the phpMyAdmin configuration that says to not allow login without a password ($cfg['Servers'][$i]['AllowNoPassword']= FALSE;
), but my mysql user (root) had no password so I couldn't login!
So as mentioned in one of the answers here I had to set password to the root user by:
# mysqladmin -u root password your-password
Then restart servers and login again