C# StreamWriter Problem

[SpecialKay]

i got a nice problem here:
my page recieves a request, it then sends a request back to the other server with all of the same params as the orignal requess, and waits for a responce the responce should be "Valid" or "Invalid"
and then my pages sends back the orignal response witch is discarded.

When i run on local.host everything works perfectly.
I upload my files to the server, and run the page and it crashes at this line of code:

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

the full function is:

    protected void Page_Load(object sender, EventArgs e)
    {
        LogAMessage.logAMessage("1");
        //Post back to either sandbox or live
        string strSandbox = "https://www.sandbox.paypal.com/cgi-bin/webscr";
        //string strLive = "https://www.paypal.com/cgi-bin/webscr";
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strSandbox);
        LogAMessage.logAMessage("2");
        //Set values for the request back
        req.Method = "POST";
        LogAMessage.logAMessage("3");
        req.ContentType = "application/x-www-form-urlencoded";
        LogAMessage.logAMessage("4");
        byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength);
        LogAMessage.logAMessage("5");
        string strRequest = Encoding.ASCII.GetString(param);
        LogAMessage.logAMessage("6");
        strRequest += "&cmd=_notify-validate";
        LogAMessage.logAMessage("7");
        req.ContentLength = strRequest.Length;
        LogAMessage.logAMessage("8");
 
        //for proxy
        //WebProxy proxy = new WebProxy(new Uri("http://url:port#"));
        //req.Proxy = proxy;
 
        //Send the request to PayPal and get the response
        StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
        LogAMessage.logAMessage("9");
        streamOut.Write(strRequest);
        LogAMessage.logAMessage("10");
        streamOut.Close();
        LogAMessage.logAMessage("11");
        StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
        LogAMessage.logAMessage("12");
        string strResponse = streamIn.ReadToEnd();
        LogAMessage.logAMessage("13");
        streamIn.Close();
        LogAMessage.logAMessage("14");
 
        if (strResponse == "VERIFIED")
        {
            LogAMessage.logAMessage("IPN is Verified");
        }
        else if (strResponse == "INVALID")
        {
            LogAMessage.logAMessage("IPN is INVALID");
        }
        else
        {
            LogAMessage.logAMessage("IPN BROKEN");
        }
    }
 
 

the LogAMessage.logAMessage() function is a simple function that writes a message to a text file. My text file gets up to number 8 and then nothing.

Thanks for your help.

[Plater]

I think when you call the RequestStream it does somesort of "pre-call" to the server....maybe?

[SpecialKay]

by "pre-call" you mean?

waiting for reply

[Plater]

Like when you say get request stream, it sends a partial request to the server "POST /somepage.asp HTTP/1.1" and then when you finish with the stream it sends the rest?
"Content-Length: 10

asdfghjklq"

[SpecialKay]

doesnt sound right,
do you have any suggestion on how i can fix it?

[Plater]

Hmm, I'm starting to doubt my original guess at the problem.
What exception is thrown?

[SpecialKay]

Absolutly NOTHING, code just stops. No exceptions at all, and it doesnt not go into the Finally()

[SpecialKay]

OOps sorry, i have now put the code into a try()catch()finally() and i have tried to catch all possible exceptions with no luck, and the finally doesnt not get called either. The code just stops.

My theory for now is simply that my server is blocking the out going request.

[SpecialKay]

Update to problem
execption thrown = Unable to connect to remote server

[Plater]

Ah ha, well that's where you need to fix, why it cannot connect to server.
Is the URL being passed to it correct?

[SpecialKay]

Answer: Firewall problem.