HttpWebRequest 请求HTTPS协议时报错：The requested security protocol is not supported. （不支持请求的安全协议）

public String Get(string url, byte[] data){HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);try{//服务器需安装.net4.5，否则报错：The requested security protocol is not supported. （不支持请求的安全协议）ServicePointManager.SecurityProtocol = ServicePointManager.SecurityProtocol = (SecurityProtocolType)192 | (SecurityProtocolType)768 | (SecurityProtocolType)3072;//SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 //ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;req.ProtocolVersion = HttpVersion.Version11;req.Method = "POST";req.KeepAlive = false;//req.Timeout = 1200000;req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";//req.Headers.Add("ContentType", "application/x-www-form-urlencoded");req.Headers.Add("appKey", appKey);req.Headers.Add("appSecret", appSecret);req.ContentLength = data.Length;using (Stream reqStream = req.GetRequestStream()){reqStream.Write(data, 0, data.Length);}using (WebResponse response = req.GetResponse()){string text = "";using (Stream responseStm = response.GetResponseStream()){StreamReader redStm = new StreamReader(responseStm, Encoding.UTF8);text = redStm.ReadToEnd();}response.Close();//response = null;req.Abort();return text;}}catch (Exception ex){if (ex.InnerException != null){HttpContext.Current.Response.Write("内部错误信息：" + ex.InnerException.Message + "<br>");}req.Abort();throw ex;}return string.Empty;}

错误1：The requested security protocol is not supported. （不支持请求的安全协议）

原因：因为服务器上需安装.net4.5,（如果无效可以尝试重装IIS）

错误2：The remote name could not be resolved: 'nginx.platform.xxxxxx.cn'

原因：服务器无法解析这个域名，需要配置DNS解析

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HttpWebRequest 请求HTTPS协议时报错：The requested security protocol is not supported. （不支持请求的安全协议）

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