Problem accessing web service using Basic authentication

Hi

I’m trying to access a web service from a mobile device using Basic authentication. Everything is running on local machine with ActiveSync 4.5 and WM 6.0 emulator and works OK when I use the Windows network credentials that I am currently logged in under.
I have created another Windows XP user (Administrator) but cannot connect using this new user, I just get a WebException on the mobile device.

Do I have to use the logged-in user’s credentials or should I be able to connect using any valid Windows user?

Any help much appreciated.

Jonathan Attree