IPN Listner not working MVC3 - paypal

Question

My IPN listner is not working.when i tried with IPN listner Error is showing as follows "We're sorry, we could not send an IPN."
But i can access the IPN Handler url from browser.
here is my IPN handler Code.
public ActionResult IPN()
{
LogMessage ("entering ipn action ");
var formVals = new Dictionary<string, string>();
formVals.Add("cmd", "_notify-validate");
string response = GetPayPalResponse(formVals, true);
LogMessage ("IPN Response received: " + response + " <-- That was response. . . ");
if (response == "VALID")
{
LogMessage("Response Was Verified");
}
else
{
LogMessage("RESPONSE WAS NOT VERIFIED");
}
return Json("Sucess",JsonRequestBehavior.AllowGet);
}
string GetPayPalResponse(Dictionary<string, string> formVals, bool useSandbox)
{
string paypalUrl = useSandbox
? "https://www.sandbox.paypal.com/cgi-bin/webscr"
: "https://www.paypal.com/cgi-bin/webscr";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(paypalUrl);
//Set values for the request back
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
byte[] param = Request.BinaryRead(Request.ContentLength);
string strRequest = Encoding.ASCII.GetString(param);
StringBuilder sb = new StringBuilder();
sb.Append(strRequest);
foreach (string key in formVals.Keys)
{
sb.AppendFormat("&{0}={1}", key, formVals[key]);
}
strRequest += sb.ToString();
req.ContentLength = strRequest.Length;
string response = "";
using (StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII))
{
streamOut.Write(strRequest);
streamOut.Close();
using (StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream()))
{
response = streamIn.ReadToEnd();
}
}
return response;
}

Answer 1

We had faced same issue before I feel it may be because your MVC Application may be published in shared hosting environment Then you have to follow some step to to make MVC RC application works
Here is the blog which help me to solve the issue.Please check this
http://helpnshareidea.blogspot.in/2013/11/mvc3-applications-in-windows-shared.html