Phpmyadmin in WHM keeps prompting for a username and password
From CPanelDirect
This article is relevant for recent PHP security changes in Cpanel from March 2008. Three new PHP users are added on the systems which are
cpanel-horde cpanel-phpmyadmin cpanel-phppgadmin
If you go into WHM and then click PHPmyadmin and it prompts for a username and password box (as opposed to going to a username and password box in phpmyadmin) and clears your WHM cookie the following must be checked for.
First check /etc/wwwacct.conf for minuid. If it shows a value under 99 change it to 100. Then remove the three new usernames with
userdel cpanel-horde userdel cpanel-phpmyadmin userdel cpanel-phppgadmin
Run /scripts/upcp --force this will recreate the users and correct the problem.

