Question

升级到Windows 8后，我遇到以前正在运行的Web服务调用问题。我已经在两台Windows 8.1计算机和一台Windows 8计算机上验证了以下代码失败，但它在Windows 7和Windows Server 2008 R2上运行正常。

var uriString = "https://secure.unitedmileageplus.com/";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uriString);

try {
    using(WebResponse response = request.GetResponse()) {
        response.Dump();
    }
}
catch(Exception e) {
    e.Dump();
}

WebException请求已中止：无法创建SSL / TLS安全信道。

它似乎已本地化到此端点，因为我能够成功地对其他URL进行SSL调用。我已经做了一些Wireshark嗅探，但不知道该寻找什么，它没有多大帮助。如果您希望我提供这些日志，请告诉我。

Answer 1

WebRequest默认情况下将TLS / SSL版本设置为TLS 1.0。您可以使用ServicePointManager.SecurityProtocol将其设置回SSL 3.0。 E.g：

static void Main(string[] args)
{
    var uriString = "https://secure.unitedmileageplus.com/";

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uriString);

    ServicePointManager.ServerCertificateValidationCallback =
        new RemoteCertificateValidationCallback(AcceptAllCertifications);

    ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

    try
    {
        using (WebResponse response = request.GetResponse())
        {
            Debug.WriteLine(response);
        }
    }
    catch (Exception e)
    {
        Debug.WriteLine(e);
    }
}

public static bool AcceptAllCertifications(
    object sender,
    System.Security.Cryptography.X509Certificates.X509Certificate certification,
    System.Security.Cryptography.X509Certificates.X509Chain chain,
    SslPolicyErrors sslPolicyErrors)
{
    return true;
}

错误：无法创建SSL / TLS安全通道Windows 8

1 个答案: