>>>I've verified the URL is correct by displaying it on the form and copying it to a new web page and running it. I did get asked to login by the Report Server, maybe that's the forbidden part?
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>>Most likely. Perhaps the System.Net.CredentialCache.DefaultCredentials on the clients machine would not have been a valid login?
>
>Hmm, should i change it to DefaultNetworkCredentials? Or do I do this differently?

I guess I'd look at the properties of the credentials used on your development machine and, since that is working, create and use the same credentials on the clients server. Of course I could be wrong - just saying what I'd try......