我已经用了一段时间了如果有用的话。

调用方必须显式地请求需要不受信任的认证，并在完成时将回调放回默认状态。

    /// <summary>
    /// Helper method for returning the content of an external webpage
    /// </summary>
    /// <param name="url">URL to get</param>
    /// <param name="allowUntrustedCertificates">Flags whether to trust untrusted or self-signed certificates</param>
    /// <returns>HTML of the webpage</returns>
    public static string HttpGet(string url, bool allowUntrustedCertificates = false) {
        var oldCallback = ServicePointManager.ServerCertificateValidationCallback;
        string webPage = "";
        try {
            WebRequest req = WebRequest.Create(url);

            if (allowUntrustedCertificates) {
                // so we can query self-signed certificates
                ServicePointManager.ServerCertificateValidationCallback = 
                    ((sender, certification, chain, sslPolicyErrors) => true);
            }

            WebResponse resp = req.GetResponse();
        
            using (StreamReader sr = new StreamReader(resp.GetResponseStream())) {
                webPage = sr.ReadToEnd().Trim();
                sr.Close();
            }
            return webPage;
        }
        catch {
            // if the remote site fails to response (or we have no connection)
            return null;
        }
        finally {
            ServicePointManager.ServerCertificateValidationCallback = oldCallback;
        }
    }

我在Internet Explorer的. net应用程序中遇到了类似的问题。

我解决了将证书(在我的例子中是VeriSign Class 3证书)添加到受信任编辑器证书的问题。

Go to Internet Options-> Content -> Publishers and import it

您可以通过以下方式导出证书:

Internet Options-> Content -> Certificates -> Intermediate Certification Authorities -> VeriSign Class 3 Public Primary Certification Authority - G5

谢谢

下面的代码片段将修复您正在调用的服务器上的SSL证书有问题的情况。例如，证书可能是自签名的，或者证书和服务器之间的主机名可能不匹配。

如果您正在调用您直接控制之外的服务器，这是危险的，因为您不能再确定您正在与您认为连接到的服务器通信。但是，如果您处理的是内部服务器，而获得“正确的”证书是不现实的，请使用以下命令告诉web服务忽略证书问题并勇敢地继续工作。

前两个使用lambda表达式，第三个使用常规代码。第一个接受任何证书。后两者至少检查证书中的主机名是否是您所期望的主机名。 ．.． 希望对你有帮助

//Trust all certificates
System.Net.ServicePointManager.ServerCertificateValidationCallback =
    ((sender, certificate, chain, sslPolicyErrors) => true);

// trust sender
System.Net.ServicePointManager.ServerCertificateValidationCallback
                = ((sender, cert, chain, errors) => cert.Subject.Contains("YourServerName"));

// validate cert by calling a function
ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(ValidateRemoteCertificate);

// callback used to validate the certificate in an SSL conversation
private static bool ValidateRemoteCertificate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors policyErrors)
{
    bool result = cert.Subject.Contains("YourServerName");
    return result;
}

添加:

 ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;}

就在你呼叫服务之前

我的解(VB。Net，这个应用程序的“登台”(UAT)版本需要与“登台”证书一起工作，但不影响请求一旦他们在现场):

    ...
        Dim url As String = ConfigurationManager.AppSettings("APIURL") & "token"
        If url.ToLower().Contains("staging") Then
           System.Net.ServicePointManager.ServerCertificateValidationCallback = AddressOf AcceptAllCertifications
        End If
    ...

    Private  Function AcceptAllCertifications(ByVal sender As Object, ByVal certification As System.Security.Cryptography.X509Certificates.X509Certificate, ByVal chain As System.Security.Cryptography.X509Certificates.X509Chain, ByVal sslPolicyErrors As System.Net.Security.SslPolicyErrors) As Boolean
        Return True
    End Function

如果您不想盲目地信任所有人，只对某些主机设置信任例外，那么下面的解决方案更合适。

public static class Ssl
{
    private static readonly string[] TrustedHosts = new[] {
      "host1.domain.com", 
      "host2.domain.com"
    };

    public static void EnableTrustedHosts()
    {
      ServicePointManager.ServerCertificateValidationCallback = 
      (sender, certificate, chain, errors) =>
      {
        if (errors == SslPolicyErrors.None)
        {
          return true;
        }

        var request = sender as HttpWebRequest;
        if (request != null)
        {
          return TrustedHosts.Contains(request.RequestUri.Host);
        }

        return false;
      };
    }
}

那就打电话给Ssl。当你的应用启动时启用托管主机。