file upload error

Hello everyone,

Here is my code at both client side and server side. My code is simple, just upload a file to an ASP.Net web site.

My client code throws exception when it works on Vista (x64, Enterprise, SP1), but works fine on Windows Server 2003.

Any ideas?

xx.xx.xx.xx is my server address in below sample.

BTW: The port 1031 is the Visual Studio's internal web server address port number -- i.e. when I press F5 in Visual Studio 2008 for the ASP.Net project.

I have tried when I publish the ASP.Net project at server side to IIS and using port 80, everything is fine, but when pressing F5 to run in Visual Studio, there is such error. Any ideas?

[Code]
Client:

       static void Main(string[] args)
        {
            Console.Write("\nPlease enter the URI to post data to : &q ...