Hi I have installed ispconfig in a debian sarge 3.1. The problem is that the mysql databases for one site doesn't created by ispconfig, if one user try login in phpmyadmin, he can't login because the database and the user not exist. In phpmyadmin, if i try login with user root and their password, i can access to phpmyadmin. (Sorry for my bad english)
Do you / the user have created a database including a user in ISPConfig? That's not done automatically when you set up a web / domain. You have to look at options there is a button for creating a new database if you allowed the user to have some. More information about that can be found in the onlinedocumentation of ISPConfig