Turning OFF auto proxy detection

I've got a problem where my HTTP WCF messages are not going where I want them
to go because my company has tightened its proxy restrictions.

Basically the AUTO-DETECTION of a proxy that has been set up for the browser
to hinder certain website access is causing .NET / WCF to use the proxy when
sending messages bound for a different web service (not the proxy).

What I want to do is make .NET / WCF NOT auto-detect the proxy. This nice
feature, which is great if you want the behavior, is causing me big headaches
because I'm ignorant of how to turn it off.

I tried turning the usesystemdefault to "false" in web.config but it didn't
help:

<defaultProxy>
<proxy usesystemdefault="true" />
</defaultProxy>

There's got to be a simple way to turn off auto proxy detection. Please help.