C# https证书通信Post/Get（解决做ssl通道时遇到“请求被中止: 未能创建 SSL/TLS 安全通道”问题）

         public static string HttpPost(string url, string param = null)
         {
             HttpWebRequest request;

             //如果是发送HTTPS请求
             if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
             {
                 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;   //协议按需选择，
                 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                 request = WebRequest.Create(url) as HttpWebRequest;
                 request.ProtocolVersion = HttpVersion.Version10;

             }
             else
             {
                 request = WebRequest.Create(url) as HttpWebRequest;
             }

             request.Method = "POST";
             request.ContentType = "application/json";
             request.Accept = "*/*";
             request.Timeout = ;
             request.AllowAutoRedirect = false;
             //查找我们导入的证书
             X509Store certStore = new X509Store(StoreName.My, StoreLocation.LocalMachine);
             certStore.Open(OpenFlags.ReadOnly);
             var aa = certStore.Certificates;
             X509Certificate2Collection certCollection = certStore.Certificates.Find(X509FindType.FindBySubjectName, "www.xxx.com", false);
             request.ClientCertificates.Add(certCollection[]);

             StreamWriter requestStream = null;
             WebResponse response = null;
             string responseStr = null;

             try
             {
                 requestStream = new StreamWriter(request.GetRequestStream());
                 requestStream.Write(param);
                 requestStream.Close();

                 response = request.GetResponse();
                 if (response != null)
                 {
                     StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                     responseStr = reader.ReadToEnd();
                     reader.Close();
                 }
             }
             catch (Exception)
             {
                 throw;
             }
             finally
             {
                 request = null;
                 requestStream = null;
                 response = null;
             }

             return responseStr;
         }

         private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
         {
             return true; //总是接受
         } 

第一步导入证书：

a、运行输入“mmc”

b、在控制台中点击“文件”——>“添加/删除管理单元”，在弹出框中依次选择“证书”-“添加”-“”-“确定”

上图点击“添加”弹出框选择“计算机账户”，一直下一步到完成。

c、证书导入，“证书”右键 选择“所有任务”，点击“导入“。

d、证书授权

1、工具下载 安装winhttpcertcfg.msi 下载地址 https://www.microsoft.com/en-us/download/details.aspx?id=19801。

2、到winhttpcertcfg安装目录运行如下命令提升账户访问权限：WinHttpCertCfg.exe -g -c LOCAL_MACHINE\MY -s "证书名" -a  "NETWORK SERVICE"。

说明：-s  证书名（如：www.xxxx.com） ；-a 授权用户

3、如果你的IIS是7.0，需要设置网站应用池标识（如图）。

4、重启IIS