C# 请求被中止。无法在共享宿主服务器C上创建ssl/tls安全通道#

我们无法使用

webrequest

或

htmlagilitypack

连接到https服务器，显示以下错误

基础连接已关闭：receive.System.Net.WebException发生意外错误：

或

无法在服务器上创建SSL/TLS安全通道

我们的代码在localhost上运行良好，我们还在代码文件中添加了以下部分，但我们无法确定为什么它只在服务器上发生

ServicePointManager.Expect100Continue = true;

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

---

如果有人对此有任何想法，请与我们分享。

有时是因为webrequest不接受自签名证书。我有一个我通常使用的单亲班。它接受所有自签名证书。如果您共享了您试图访问的url，则更容易确定是否有更简单的解决方案

public sealed class Certificates
{
    private static Certificates instance = null;
    private static readonly object padlock = new object();

    Certificates()
    {
    }

    public static Certificates Instance
    {
        get
        {
            lock (padlock)
            {
                if (instance == null)
                {
                    instance = new Certificates();
                }
                return instance;
            }
        }
    }
    public void GetCertificatesAutomatically()
    {
        ServicePointManager.ServerCertificateValidationCallback +=
            new RemoteCertificateValidationCallback((sender, certificate, chain, policyErrors)
                => { return true; });
    }

    private static bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        //Return true if the server certificate is ok
        if (sslPolicyErrors == SslPolicyErrors.None)
            return true;

        bool acceptCertificate = true;
        string msg = "The server could not be validated for the following reason(s):\r\n";

        //The server did not present a certificate
        if ((sslPolicyErrors &
            SslPolicyErrors.RemoteCertificateNotAvailable) == SslPolicyErrors.RemoteCertificateNotAvailable)
        {
            msg = msg + "\r\n    -The server did not present a certificate.\r\n";
            acceptCertificate = false;
        }
        else
        {
            //The certificate does not match the server name
            if ((sslPolicyErrors &
                SslPolicyErrors.RemoteCertificateNameMismatch) == SslPolicyErrors.RemoteCertificateNameMismatch)
            {
                msg = msg + "\r\n    -The certificate name does not match the authenticated name.\r\n";
                acceptCertificate = false;
            }

            //There is some other problem with the certificate
            if ((sslPolicyErrors &
                SslPolicyErrors.RemoteCertificateChainErrors) == SslPolicyErrors.RemoteCertificateChainErrors)
            {
                foreach (X509ChainStatus item in chain.ChainStatus)
                {
                    if (item.Status != X509ChainStatusFlags.RevocationStatusUnknown &&
                        item.Status != X509ChainStatusFlags.OfflineRevocation)
                        break;

                    if (item.Status != X509ChainStatusFlags.NoError)
                    {
                        msg = msg + "\r\n    -" + item.StatusInformation;
                        acceptCertificate = false;
                    }
                }
            }
        }

        //If Validation failed, present message box
        if (acceptCertificate == false)
        {
            msg = msg + "\r\nDo you wish to override the security check?";
            //          if (MessageBox.Show(msg, "Security Alert: Server could not be validated",
            //                       MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
            acceptCertificate = true;
        }

        return acceptCertificate;
    }

}

只需在执行类似的web请求之前调用该方法

Certificates.Instance.GetCertificatesAutomatically();

此外，如果我们能够看到（代码）您是如何提出webrequest的，那么它将有助于诊断问题