HttpWebRequest无法连接远程服务器

问题说明：当使用HttpWebRequest req = (HttpWebRequest)WebRequest.Create(this.url)打开需要身份认证的网页时，显示无法连接远程服务器。

原因：需要认证。

解决方法：

　　原代码

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(this.url)

　　改为　　　

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(this.url)
req.PreAuthenticate = true;
NetworkCredential myCred = new NetworkCredential("userName", "password", "domain");
req.Credentials = myCred;
req.Method = "GET";
req.SendChunked = false;

并且该方法适用于所有Windows认证。