While trying to login to Phpmyadmin in WHM, it keeps prompting for a username and password. This is the Fix I found :-
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1)Open the file /etc/wwwacct.conf and check the value of minuid. If it is less than 99 change it to 100. Then remove the following users from the server.
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[root@server ~]#userdel cpanel-horde
[root@server ~]#userdel cpanel-phpmyadmin
[root@server ~]#userdel cpanel-phppgadmin
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2)Run upcp
[root@ourserver ~]#/scripts/upcp –force
This will recreate the users and fix the issue.