c# HttpWebRequest ，无法创建SSL / TLS安全通道
0
悬赏园豆：20
[已解决问题]
解决于 2022-08-18 10:32
HttpWebRequest ，无法创建SSL / TLS安全通道，在win7系统上不行，在win10可以
已经添加了ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;也不行
电脑也安装了.net framework 4.6,为什么还会提示无法创建SSL / TLS安全通道？
//添加了下面的代码也不行
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
问题补充：
win7 32位系统sp1，浏览器可访问tls1.2的网站，
安装了.net frawork4.6，
注册文件添加了tls1.2，
IISCrypto.exe也使用了，
启用了ssl密码套件顺序，
代码访问失败，
最后办法：电脑换了win10系统
最佳答案
0
试试这样，之前台湾老兄教我的：
private static void EnableSSL()
{
var logger = LogManager.GetCurrentClassLogger();
try
{ //try TLS 1.3
ServicePointManager.SecurityProtocol = (SecurityProtocolType)12288
| (SecurityProtocolType)3072
| (SecurityProtocolType)768
| SecurityProtocolType.Tls;
logger.Info("TLS 1.3");
}
catch (NotSupportedException)
{
try
{ //try TLS 1.2
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072
| (SecurityProtocolType)768
| SecurityProtocolType.Tls;
logger.Info("TLS 1.2");
}
catch (NotSupportedException)
{
try
{ //try TLS 1.1
ServicePointManager.SecurityProtocol = (SecurityProtocolType)768
| SecurityProtocolType.Tls;
logger.Info("TLS 1.1");
}
catch (NotSupportedException)
{ //TLS 1.0
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
logger.Info("TLS 1.0");
}
}
}
}
最好确认一下服务器的TLS版本是不是较高。
可参考下我之前的提问：https://q.cnblogs.com/q/134234/
收获园豆：20
我电脑win10的，是可以访问的，用的就是tls1.2，
我试试
您好，服务器用的是tls1.2，可是win7的电脑我在注册表里加了tls1.2，还是不能用，为什么？
@HYRUI: 是不是framework版本低，你们用的什么版本
@会长: 4.6的，会不会是电脑系统的问题？
@HYRUI: 有可能，和操作系统或framwork版本有关，要不你在别的win7电脑上试试
@会长: 主要我在俩win7电脑都按照网上所有的办法都试了，就特别神奇，其中一台把ssl密码套件顺序启用后试了一下，能访问，再试之后一次也访问不上，另一台就一直不行
其他回答(1)
0
贴全部代码,我来看看
ServicePointManager.SecurityProtocol = ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
//| SecurityProtocolType.Tls
//| SecurityProtocolType.Tls12 //Tls11
//| SecurityProtocolType.Tls11;
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
string url =//地址
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "GET";
request.Host = "";
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36";
request.Headers.Add("Accept-Encoding", "gzip, deflate, br");
request.Headers.Add("Accept-Language", "zh-CN,zh-TW;q=0.9,zh;q=0.8,en-US;q=0.7,en;q=0.6");
//ServicePointManager.Expect100Continue = true;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader read = new StreamReader(stream);
string text = read.ReadToEnd();
read.Close();
stream.Close();