C# paypal集成时出错

我曾尝试将

paypal沙盒

与我在asp.net中的项目集成

重定向到贝宝沙盒工作非常好！你可以查看你的购物车！你可以付款！但问题是当paypal设置重定向到my Success.aspx页面时

我得到的错误是

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.0.101:808

我正在使用流编写器对象

等等，让我发布我的代码

这是Success.aspx的页面

   protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                // Used parts from https://www.paypaltech.com/PDTGen/
                // Visit above URL to auto-generate PDT script

                authToken = WebConfigurationManager.AppSettings["PDTToken"];

                //read in txn token from querystring
                txToken = Request.QueryString.Get("tx");


                query = string.Format("cmd=_notify-synch&tx={0}&at={1}", txToken, authToken);

                // Create the request back
                string url = WebConfigurationManager.AppSettings["PayPalSubmitUrl"];
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

                // Set values for the request back
                req.Method = "POST";
                req.ContentType = "application/x-www-form-urlencoded";
                req.ContentLength = query.Length;

                // Write the request back IPN strings
                StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
                stOut.Write(query);
                stOut.Close();

                // Do the request to PayPal and get the response
                StreamReader stIn = new StreamReader(req.GetResponse().GetResponseStream());
                strResponse = stIn.ReadToEnd();
                stIn.Close();

                // sanity check
                Label2.Text = strResponse;

                // If response was SUCCESS, parse response string and output details
                if (strResponse.StartsWith("SUCCESS"))
                {
                    PDTHolder pdt = PDTHolder.Parse(strResponse);
                    Label1.Text = string.Format("Thank you {0} {1} [{2}] for your payment of {3} {4}!",
                        pdt.PayerFirstName, pdt.PayerLastName, pdt.PayerEmail, pdt.GrossTotal, pdt.Currency);
                }
                else
                {
                    Label1.Text = "Oooops, something went wrong...";
                }
            }
        }

这句话会产生错误

StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);

发生这些类型的异常

    Exception Details: System.Net.Sockets.SocketException:
 A connection attempt failed because the connected party did
 not properly respond after a period of time, 
or established connection failed because connected
 host has failed to respond 192.168.0.101:808

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首先，不要将PDT和IPN混合使用-只需使用IPN即可。进入PayPal admin，确保返回URL未设置在那里，并且未启用PDT

网上有一个IPN课程可用于此目的-更多信息（注意：我自己的博客帖子）：

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发帖子可能非常棘手。您是否使用Fiddler2或其他请求捕获程序来捕获请求？我会去网站，尝试做一个测试提交的付款，看看后的要求，你也可以捕捉到它在大多数浏览器现在。分析它。检查您的返回URL-看起来您缺少端口号后面的零？也要遵循Algothym的建议，检查完整的请求URL（如果必须，请将其写入输出）