Cakephp routes problem

I use cakephp version 1.3.6 and I have a front end and a back end.
So I want the front end to use sites controller and the backend (/admin) to connect to the users, controller .
I tried to use this but it did not work .
For example I set

Router::connect('/', array('controller' => 'sites'));
...............
Router::connect('/users/:action/*', array('controller' => 'users'));

but /users/index redirect to default controller.
What can I do?

I thing I solved it.
I used asl,so I had to login.
Also I set at routes.php

Router::connect('/', array('controller' => 'sites'));