由于以下错误消息，我们无法使用WebRequest连接到HTTPS服务器:
请求被中止:无法创建SSL/TLS安全通道。
我们知道服务器没有有效的HTTPS证书，但为了绕过这个问题，我们使用下面的代码，我们从另一个StackOverflow帖子:
private void Somewhere() {
ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(AlwaysGoodCertificate);
}
private static bool AlwaysGoodCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors policyErrors) {
return true;
}
问题是服务器从未验证证书，并出现上述错误而失败。有人知道我该怎么做吗?
我应该提到的是，我和一个同事几周前进行了测试，它运行得很好，与我上面写的类似。我们发现的唯一“主要区别”是，我用的是Windows 7，而他用的是Windows XP。这会改变什么吗?
system.net.webeexception:请求被中止:无法创建
SSL/TLS安全通道。
在我们的例子中，我们使用的是软件供应商，所以我们没有权限修改。net代码。显然。net 4不会使用TLS v 1.2，除非有变化。
我们的解决方法是将SchUseStrongCrypto键添加到注册表中。您可以将下面的代码复制/粘贴到扩展名为.reg的文本文件中并执行它。它是我们解决问题的“补丁”。
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001
没有一个答案对我有用。
这是有效的方法:
而不是像这样初始化我的X509Certifiacte2:
var certificate = new X509Certificate2(bytes, pass);
我是这样做的:
var certificate = new X509Certificate2(bytes, pass, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
注意X509KeyStorageFlags。出口! !
我没有改变其余的代码(WebRequest本身):
// I'm not even sure the first two lines are necessary:
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
request = (HttpWebRequest)WebRequest.Create(string.Format("https://{0}.sii.cl/cvc_cgi/dte/of_solicita_folios", server));
request.Method = "GET";
request.Referer = string.Format("https://hercules.sii.cl/cgi_AUT2000/autInicio.cgi?referencia=https://{0}.sii.cl/cvc_cgi/dte/of_solicita_folios", servidor);
request.UserAgent = "Mozilla/4.0";
request.ClientCertificates.Add(certificate);
request.CookieContainer = new CookieContainer();
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
// etc...
}
事实上，我甚至不确定前两行是否有必要……
After days of pulling what hair I have left out, we solved the problem. I tried everything suggested on this post and nothing worked for me. For us, we had a basic .Net Framework 4.8 console app running on a customers Windows VM. The on-premise server we were communicating with required that SSL Certificate Validation was turned off. One of our guys discovered that the server required we were using TLS 1.0 and on the registry settings of the VM, TLS 1.0 was disabled. Once we enabled that, it worked. I also needed to added the following two lines as mentioned many times above:
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
确保ServicePointManager设置是在创建HttpWebRequest之前完成的，否则它将无法工作。
工作原理:
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12
| SecurityProtocolType.Ssl3;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://google.com/api/")
失败:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://google.com/api/")
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12
| SecurityProtocolType.Ssl3;
我终于找到了答案(我没有注明我的来源，但它来自一次搜索);
虽然代码在Windows XP中工作，但在Windows 7中，你必须在开头添加这个:
// using System.Net;
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// Use SecurityProtocolType.Ssl3 if needed for compatibility reasons
现在，它工作得很完美。
齿顶高
Robin French提到过;如果你在配置PayPal时遇到了这个问题，请注意从2018年12月3日开始他们将不支持SSL3。您需要使用TLS。这是关于它的Paypal页面。
