I have an error below. is there any idea about it.


Dim Req As HttpWebRequest =
WebRequest.Create("https://certification.authorize.net/gateway/transact.dll?"
& postdata)
Response.Write("3")
Req.Method = "POST"
Req.AllowAutoRedirect = True
Req.Proxy = System.Net.WebProxy.GetDefaultProxy()
Req.Timeout = 100000
Req.ProtocolVersion = HttpVersion.Version11
Req.ContentLength = postdata.Length
Req.ContentType = "application/x-www-form-urlencoded"
Req.KeepAlive = False
postdata = ""
Req.ContentLength = postdata.Length
Req.AllowWriteStreamBuffering = True

Dim result As String
Dim objResponse As HttpWebResponse = Req.GetResponse()
Dim sr As StreamReader
sr = New StreamReader(objResponse.GetResponseStream())
result = sr.ReadToEnd
Response.Write(result)
sr.Close()




An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:

[WebException: The underlying connection was closed: Unable to connect to
the remote server.]
System.Net.HttpWebRequest.CheckFinalStatus() +677
System.Net.HttpWebRequest.EndGetResponse(IAsyncRes ult asyncResult) +140
System.Net.HttpWebRequest.GetResponse() +249
WebMeals.CC.Button1_Click(Object sender, EventArgs e)
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPo stBackEventHandler.RaisePostBackEvent(String
eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler
sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1292