c# - 基础连接已关闭。 (HttpWebRequest)

我有一个正在运行的HttpWebRequest，几周后，它突然停止工作并开始引发错误：

这是我的代码：


  基础连接已关闭：发生意外错误
  发送

HttpWebRequest FirstRequest = null;
HttpWebRequest postRequest = null;
HttpWebResponse response = null;
try
{
    FirstRequest = (HttpWebRequest)WebRequest.Create("https://my.emerchantpay.com");
    FirstRequest.CookieContainer = new CookieContainer();
    FirstRequest.CookieContainer = _cookies;
    FirstRequest.Accept = @"text/html, application/xhtml+xml, */*";
    FirstRequest.Referer = @"https://my.emerchantpay.com";
    FirstRequest.Headers.Add("Accept-Language", "en-GB");
    FirstRequest.UserAgent = @"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)";
    FirstRequest.Host = @"my.emerchantpay.com";
    response = (HttpWebResponse)FirstRequest.GetResponse();//here is error
}catch{}

我究竟做错了什么？

最佳答案

经过长期的研究，我找到了答案。

您需要添加ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
 FirstRequest = (HttpWebRequest)WebRequest.Create("https://my.emerchantpay.com");
                    FirstRequest.CookieContainer = new CookieContainer();
                    FirstRequest.CookieContainer = _cookies;
                    FirstRequest.Accept = @"text/html, application/xhtml+xml, */*";
                    FirstRequest.Referer = @"https://my.emerchantpay.com";
                    FirstRequest.Headers.Add("Accept-Language", "en-GB");
                    FirstRequest.UserAgent = @"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)";
                    FirstRequest.Host = @"my.emerchantpay.com";

                    response = (HttpWebResponse)FirstRequest.GetResponse();