I am trying to access a URI through HttpWebRequest and am getting the "target machine actively refused" error.

I know from a machine that has no proxy this works fine and i know my corp internet uses a PAC file to determine the proxy however it doesnt seem to be picking this up for me.

Here is what i know:

• My app.config has
• I presume i dont need to specify WebRequest.DefaultWebProxy but that makes no difference
• I can explictly set the proxy with WebProxy and NetworkCredentials which works

Any ideas? Anybody have experience with PAC files and why I can access the target through IE but not through code. obviously if i hardcode the proxy it all works so it would seem that this same proxy is not being auto detected?