> I am trying to grab a website behind a form
> authentication.  First, I tried in Vista(via boot
> camp) using Httrack's GUI, but after plugging in the
> proxy information, the request timed out.  The proxy

Proxy and form authentication are two separate things.

If your browser requires a proxy then so does httrack.

To capture, you temporarily point your browser to use httrack as a proxy.
httrack's proxy info will be your machine plus port address since it's running
on your machine.
<http://httrack.kauler.com/help/Authentication>