Problem Using Secure Nat in Isa 2004

[brunopt]

Hello everyone, i have read that the securenat clients don´t provide username authentication, so if a point a machine to use a default gateway as the isa server, i have full access bypassing the firewall rules and other security issues. So i have done that and don´t work. I only have access to internet using the webproxy configuration. How can i use securenat to access the internet without configuring IE proxy settings.

Thanks to all