a customer complains that he is unable to log into phpMyAdmin from his
cPanel and getting phpmyadmin login window or login failed error, first
check and see if it is a server wide issue. If it is a server wide issue
force upgrading phpMyAdmin will fix the issue. For that,
SSH to your server as root and update phpmyadmin :
#/usr/local/cpanel/bin/updatephpmyadmin --force If the issue is only for one user, do the following
1) Log into WHM and go to Account Functions »Password Modification 2) Select user account and update password with the same as current one
Note : While updating password for user make sure "Allow MySQL password change" option is checked.