phpmyadmin login

Does anyone know why i cant login to phpmyadmin via the ip address ? (http://ipaddress/phpmyadmin takes me to the login page but just times out after entering credentials) i can login fine using a domain name but if i login to cwp with domain name rouncube stops working

nevermind Wiresharl shows my browser communication with Varnish

I have edited  config.inc.php  and put this line  $cfg['PmaAbsoluteUri'] = 'http://yoursitename/phpMyAdmin/'; 
under  /* Authentication type */

the cookie is correct and link is working now