Upgrade from ASP.NET 1.1 to ASP.NET 2.0 now web service call fails

Question

I have an ASP.NET application that I've upgraded from version 1.1/Visual Studio 2003 to Visual Studio 2008 (.NET framework 3.5, ASP.NET 2.0).

A call to a web service outside of my application (but inside of our network and firewall) that used to work fine in the old version is now responding with:

The request failed with HTTP status 403: Forbidden.

The web service has not changed. The web service is in my project as a web reference.

The error occurs if I'm running the app from within Visual Studio 2008 or directly from a browser using "http://localhost.blah.blah".

Is there a configuration setting I need to make either in my application or in IIS that I didn't have to make before?

Thanks.

Answer 1

The response is coming from the server-side and it is telling you authentication failed. So, the first question I'd ask is "how is this thing authenticating?" and walk up that tree.