I'm sure I'm doing something wrong

I have a RH9 Linux machine looking at a small secure network on one side
and my company's intranet (with Internet access from there). I am
trying to configure my machine to act as a proxy using Apache, giving
the secure network Internet access. However, when I follow everything
I've read, computers trying to use the proxy connect to the Apache test
page. No matter what URL I point to, I end up on the test page.

What am I doing wrong?

Also, anytime I open the Apache configuration wizard, it resets
everything I've customized in httpd.conf to allow the proxy in the first
place.

I know just enough to be dangerous.

Geoff Fox