Getting http 403 error when accessing website from remote client

[Sixitysix]

I have created an asp.net website that is to be accessed from client browsers running on the same domain.I've hosted the site on IIS 7.5I have disabled Anonymous Authentication and Enabled Windows Authentication from the Features View under the IIS section.I have added the following in the web.config for the site:\[code\]<authorization> <allow users="group\BizTalk Application Users" /> <deny users="?" /></authorization>\[/code\]I am able to open the website from a browser when running on the server that is hosting the site. However, if I then logon to a different server in the same domain, using the same credentials, when I try to browse to the site I get an http 403 error.Can anyone tell me what I've done wrong?Thanks, Rob.