C# 基础连接已关闭。（HttpWebRequest）

我有一个

HttpWebRequest

正在工作，几周后，它突然停止工作并开始抛出错误：

这是我的密码：

基础连接已关闭：上发生意外错误 发送

---

我做错了什么？

经过长时间的研究，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();

两者相加后
ServicePointManager.SecurityProtocol=SecurityProtocolType.Tls12

及

为我工作
使用Fiddler调试此场景…url包含
https
方案。您不打算使用任何身份验证吗？+1在.NET 4.0中（其中
SecurityProtocolType.Tls12
缺失）您需要使用
（SecurityProtocolType）0xc00
-请参阅
 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();

FirstRequest.Keepalive = false;