how to consume web service behind proxy server?

Hi
The small issue spent my age of time. make me almost crazy.

I am using biztalk 2004 and visual studio 2003.

I can invoke the web service through asp.net, BUT i generate the proxy class by using wsdl.exe.

For biztalk, I have to use \”add web reference\” instead of using wsdl.exe because i dont know how to generate web port and inbound/outbound message for the service.

I have configure my IE browser’s connection proxy and also configure the following code in machine.config.
<proxy
usesystemdefaults=\”true\”
proxyaddress=\”http://proxyserver:port\”
bypassonlocal=\”true\”
/>

web service is working fine with IE browser.

HOWEVER when i use \”add web reference\”, A dialog \”Discovery Credential for proxy server\” pop out and ask \”user name\”, \”password\”, and \”domain\”.

One thing i am not sure is domain, where do i get my domain? using \”net\” command?

Another after change machine.config, do i really need to restart computer? (i have tried to restart computer, really time consuming)

Anyone has use web service behind proxy server, Could you share your expereince with me? thank you very much