使用HttpWebRequest请求Https网站时，程序抛出错误：System.Net.WebException:“请求被中止: 未能创建 SSL/TLS 安全通道。”
具体代码如下：
if (en == null) en = Encoding.UTF8;
String html;
if (url.IndexOf("https") > -1)
{
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls;
}
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Timeout = 600000;
//这里报错：System.Net.WebException:“请求被中止: 未能创建 SSL/TLS 安全通道。”
WebResponse response = request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream, en);
String responseFromServer = reader.ReadToEnd();
html = responseFromServer;
Encoding en2 = GetEncoding(response.ContentType);//responseFromServer
reader.Close();
response.Close();最佳解决方案
要保证HttpWebRequest请求HTTPS网站时，双方支持的SSL/TLS的版本一致才能建 SSL/TLS 安全通道。可以在创建HttpWebRequest之前把net支持的SSL/TLS协议全部指定上去，比如：
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
CheckValidationResult实现方法：
收藏 private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true; //总是接受
}
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