consuming web service fails on proxy

[J Ames]

I'm confused on this one. I work behind our company firewall. I created a
web service that accesses an external web site, using the WebProxy class,
and when I test the web service in the browser, it works perfectly. It
passes the correct credentials and returns data as expected. However, when
I attempt to consume the web service in an ASP.NET project, it fails. I'm
getting a http error (bad gateway), so I think it's failing at the proxy.
I'm not sure why it would do that since it sets the proxy credentials in the
service and works on a browser http request.

Is there some other step I need to take?

Thanks,
J