While accessing PHPmyadmin in cpanel, you are getting following error
PHPMyAdmin :: Existing configuration file (./config.inc.php) is not readable
1) Login to the server using root user
2) check the permission of the following file
root@Server[~]#ls -ld /usr/local/cpanel/base/3rdparty/phpMyAdmin/config.inc.php
It should be
-rw-r—– 1 root cpanelphpmyadmin 1749 Oct 11 23:06 /usr/local/cpanel/base/3rdparty/phpMyAdmin/config.inc.php
3) If not then change ownership and file permission to above using following commands.
chown root:cpanelphpmyadmin /usr/local/cpanel/base/3rdparty/phpMyAdmin/config.inc.php
chmod 640 /usr/local/cpanel/base/3rdparty/phpMyAdmin/config.inc.php
That is it, you are all done. Cheers.