mysql root login

Hi , i cannot login with root user to the mysql managed by webmin, did anyone have the same problem?

I can do it with other users though (users from virtual servers)

i am sure its not a host-related, password or firewall issue

i think there is some configuration that prevents to login with root but i dont know where.

The objective of this is to have one phpmyadmin installation in one virtualserver, where i will manage all the mysql dbs

thanks in advance