I have an asp.net application running on Windows XP. SQL Server is running on the same machine. To login the user browses to http://machinename/default.aspx. Here they enter log in details and can use the application.

This works fine on all the other machines that I have deployed the app (usually laptops where the sales agents can then demo the app live)

One machine keeps giving the error above so i figure it must be something to so with the browser settings.

I have tried setting "Never dial a connection" in the Internet Options but this gives the error "The pages cannot be displayed"

I have also tried unchecking "work offline" but this lets the user browse through the app but there is no functionality available - if they click a next button on a page nothing happens.

Would really appreciate any suggestions

Thanks!