WebException: The SSL connection could not be established, see inner exception. The remote certificate is invalid according to the validation procedure.

代码如下：

			HttpWebRequest request = null;
            request = (HttpWebRequest)WebRequest.Create(pURLIn);
            request.AllowAutoRedirect = true;
            request.Timeout = 20000;
            request.MaximumAutomaticRedirections = 10;
            request.Method = "GET";
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.76 Safari/537.36";
            request.Accept = " text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            //不保持连接  
            request.KeepAlive = false;
            // 获取对应HTTP请求的响应  
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                return response.ResponseUri.OriginalString;
            }
            else
            {
                return response.StatusDescription;
            }

开发状态下，临时处理（或者没什么特殊安全要求的情况下最简单处理）：

ServicePointManager.ServerCertificateValidationCallback =
	delegate(object sender, X509Certificate certificate, X509Chain chain,
	SslPolicyErrors sslPolicyErrors) { return true; };

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