使用https协议访问某个URL，或者调用WEB SVC时，出现连接断开的情况

使用https协议访问某个URL，或者调用WEB SVC时，出现连接断开的情况

由于服务端SSL证书不可信，导致调用https的Web serivce 出现"基础连接已经断开"（ The underlying connection was closed）的错误，对于这个错误，可以使用代码忽略

.Net1.0的做法:

     public   class  AcceptServerNameMismatch : ICertificatePolicy
     {
        // HACK: This is a workaround.  The .NET Framwork should expose these, but they don't.
        public enum CertificateProblem : long
        {
            CertEXPIRED = 2148204801,
            CertVALIDITYPERIODNESTING = 2148204802,
            CertROLE = 2148204803,
            CertPATHLENCONST = 2148204804,
            CertCRITICAL = 2148204805,
            CertPURPOSE = 2148204806,
            CertISSUERCHAINING = 2148204807,
            CertMALFORMED = 2148204808,
            CertUNTRUSTEDROOT = 2148204809,
            CertCHAINING = 2148204810,
            CertREVOKED = 2148204812,
            CertUNTRUSTEDTESTROOT = 2148204813,
            CertREVOCATION_FAILURE = 2148204814,
            CertCN_NO_MATCH = 2148204815,
            CertWRONG_USAGE = 2148204816,
            CertUNTRUSTEDCA = 2148204818
        }
        /**//// <summary>
        /// Implement CheckValidationResult to ignore problems that we are willing to accept.
        /// </summary>
        public bool CheckValidationResult(ServicePoint sp, X509Certificate cert,
        WebRequest request, int problem)
        {
            /**//*
            int CertificateNameDoesntMatch = unchecked( (int) CertificateProblem.CertCN_NO_MATCH);
            if ( problem == CertificateNameDoesntMatch ) // only accept server name failed match
            return true;
            // The 1.1 framework calls this method with a problem of 0, even if nothing is wrong
            return (problem == 0);
            */
            return true;
        }
    }

System.Net.ServicePointManager.CertificatePolicy  =   new  AcceptServerNameMismatch(); 

.Net2.0+ 的做法，增加一个委托，在委托中判断并忽略

using  System.Net.Security;
using  System.Security.Cryptography.X509Certificates;

ServicePointManager.ServerCertificateValidationCallback  +=
             delegate ( object  sender, X509Certificate cert, X509Chain chain, SslPolicyErrors sslError)
             {
                bool validationResult = true;
                return validationResult;
            } ;