C#客户端模拟Https请求，证书验证不通过报错未能为 SSL/TLS 安全通道建立信任关系

[悲伤的肉包子]

做了一个C# form客户端，从本地读取cer证书，往服务器页面发送Https的请求，但是证书验证老是报错System.Net.WebException: 基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系，网上有无视验证的方法，就是在客户端重写验证函数，让它一直返回true，但俺就想执行服务器对证书进行验证，因为要统计一个Https请求的时间（包括证书验证），所以想问问有没有其它的好方法，小菜鸟求助。

 //HTTPS请求
        public static bool GetHttpsResponse(string url, string method, string content, string cerPath, out string response, out string errorMsg)
        {
            errorMsg = "";
            response = "";

            //方法返回的结果，当调用接口成功后返回
            bool result = true;

            //判断是参数是否合法
            if (string.IsNullOrEmpty(url) == true)
            {
                result = false;
                errorMsg = "url 不能为空";
            }
            //发送的内容不能为空
            if (string.IsNullOrEmpty(content) == true)
            {
                result = false;
                errorMsg = "content 不能为空";
            }

            if (File.Exists(cerPath) == false)
            {
                result = false;
                errorMsg = "“" + cerPath + "” 指定的证书不存在";
            }

            try
            {
                
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);


                //User-AgentHTTP标头的值
                req.UserAgent = "Client Cert Sample";
                req.Method = method.ToString();
                req.Timeout = 1000 * 10;//超时间10秒；
                req.KeepAlive = true;
                req.ContentType = "application/x-www-form-urlencoded";


                //创建证书文件
                X509Certificate objx509 = new X509Certificate(cerPath);

                //添加证书到请求里
                req.ClientCertificates.Add(objx509);

                byte[] contentBytes = Encoding.GetEncoding("UTF-8").GetBytes(content);

                req.ContentLength = contentBytes.Length;

                Stream reqStream = req.GetRequestStream();
                reqStream.Write(contentBytes, 0, contentBytes.Length); //添加参数到请求

                reqStream.Close();

                HttpWebResponse rep = (HttpWebResponse)req.GetResponse();

                StreamReader smr = new StreamReader(rep.GetResponseStream());

                response = smr.ReadToEnd();

            }
            catch (Exception ex)
            {
                errorMsg = ex.Message;
                result = false;
            }
            return result;
        }

[悲伤的肉包子]

求链接

[悲伤的肉包子]

没有人给点指点嘛

[harveyXXX]

//User-AgentHTTP标头的值
req.UserAgent = "Client Cert Sample";
req.Method = method.ToString();
req.Timeout = 1000 * 10;//超时间10秒；
req.KeepAlive = true;
req.ContentType = "application/x-www-form-urlencoded";
之后添加
req.ProtocolVersion=HttpVersion.Version10;
试一下。