The underlying connection was closed: An unexpected error occurred on a receive.

Question

When I try my program on my win2k8 machine it runs fine but on win 2k3 it gives me this error that error message

here's the code that' generating the error

 WebClient wc = new WebClient();
 wc.DownloadFile("ftp://ftp.website.com/sample.txt");

have search the web for hours, couldn't find any solution.

please help

thanks