HttpWebRequest 访问网页，返回System.IO.IOException: 由于远程方已关闭传输流，身份验证失败

lgqiu2008 2016-04-14 11:30:20

网址：https://passport.yhd.com/passport/login_input.do
1号店网站更新，原来可以通过httpwebrequest访问的，更新后不能访问(通过浏览器可以正常访问)，提示如下：
System.Net.WebException: 基础连接已经关闭: 发送时发生错误。 ---> System.IO.IOException: 由于远程方已关闭传输流，身份验证失败。

运行环境是.NET 2.0

已百度，找了N种办法
1、ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
2、request.ProtocolVersion = HttpVersion.Version10;
3、ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
4、ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
5、换UserAgent
都不行，请教高人如何解决。

附源码：



      // 请先增加引用 

using System.Web;

using System.Net;

using System.IO;

using System.Net.Security;

using System.Security;

using System.Security.Cryptography;

using System.Security.Cryptography.X509Certificates;

using System.Runtime.InteropServices;



       public  CookieContainer mycookiecontainer = new CookieContainer();

        /// <summary>

        /// "GET"

        /// </summary>

        /// <param name="url">web url</param>

        /// <param name="Referer">web referer</param>

        /// <returns>return the web access result </returns>

        public static string GetAccess(string url, string Referer)

        {

            try

            {

                HttpWebRequest res = (HttpWebRequest)WebRequest.Create(url);

                res.CookieContainer = mycookiecontainer;

                res.Method = "GET";

                //res.Proxy = null;

                ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);

                res.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";

                //res.Headers.Add("Accept-Encoding", "gzip, deflate");

                res.Headers.Add("Accept-Language", "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");

                //res.KeepAlive = false;

                res.ProtocolVersion = HttpVersion.Version11; 

                if (Referer != "")

                {

                    res.Referer = Referer;

                }

                res.UserAgent = "Mozilla/5.0 (Windows NT 5.1; rv:30.0) Gecko/20100101 Firefox/30.0";

                using (HttpWebResponse resp = (HttpWebResponse)res.GetResponse())

                {

                    resp.Cookies = FormMain.mycookiecontainer.GetCookies(res.RequestUri);

                    using (Stream responseStream = resp.GetResponseStream())

                    {

                        //如果网页流压缩了，要加下面一句

                        //responseStream = new GZipStream(responseStream, CompressionMode.Decompress);

                        using (StreamReader mySreamReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8")))//GB2312,utf-8,GBK

                        {

                            string responseData = mySreamReader.ReadToEnd();

                            responseStream.Close();

                            mySreamReader.Close();

                            resp.Close();

                            return responseData;

                        }

                    }

                }

            }

            catch (Exception ex)

            {

                return ex.ToString();

            }

        }



        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)

        {

            return true;// Always accept

        }



     //增加一button,并click事件增加以下代码

            private void button1_Click(object sender, EventArgs e)

        {

            string loginUrl1 = "https://passport.yhd.com/passport/login_input.do";

            string result1 = WebTool.GetAccess(loginUrl1, "");

            //报错：由于远程方已关闭传输流，身份验证失败

        }