今天做项目中进行https请求时遇到这样的调试错误，内部错误：未能为 SSL/TLS 安全通道建立信任关系。错误页面：根据验证过程,远程证书无效。经过分析，在浏览器中打开要进行一个安全确认。就是这个对话框引起的问题。在网上搜了一下一般的解决办法，但是搜的内容比较少，现在在这里总结一下。

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;

public partial class _Default : System.Web.UI.Page
{
    PRotected void Page_Load(object sender, EventArgs e)
    {
        //for 1.1 在2.0下ServicePointManager.CertificatePolicy已经过时
        //ServicePointManager.CertificatePolicy = new AcceptAllCertificatePolicy();
        //for 2.0
        //ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://someurl");
        request.Method = "GET";
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream receiveStream = response.GetResponseStream();
        StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
        Page.Response.Write(readStream.ReadToEnd());
        response.Close();
        readStream.Close();
    }
    //for 2.0
    public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
    {   //   Always   accept  
        return true;
    }
    //for 1.1
    internal class AcceptAllCertificatePolicy : ICertificatePolicy
    {
        public AcceptAllCertificatePolicy()
        {
        }

        public bool CheckValidationResult(ServicePoint sPoint, System.Security.Cryptography.X509Certificates.X509Certificate cert, WebRequest wRequest, int certProb)
        {
            //   Always   accept  
            return true;
        }
    }
}

http://www.cnblogs.com/david8k/archive/2006/11/06/551911.html