webClient DownloadData套接字异常

Question

我使用webClient.DownloadData从Azure网站从Google云端硬盘下载文件，我收到错误：

SocketException An attempt was made to access a socket in a way forbidden by its access permissions 74.125.128.102:80
    at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)

代码：

using (var webClient = new WebClient())
                {
                    pdf = webClient.DownloadData("drive.google.com/something.pdf");
                }

它适用于局部但不是天蓝色。

我正在免费使用Azure网站进行测试。