block access to tomcat admin gui

Hi,

I've Tomcat Stack on RHEL5.
I'm starting with 1 app and I want that people can't access to the tomcat admin-gui from Internet.
I want that only localhost can manage this admin-gui, and If I put mydomain.com I see the Welcome page of bitnami.. Is there some option to desactivate this for the external users(Internet).

thanks Edu.