Http Post Error: 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.

Hi all,

I am facing HTTP POST problem:

The following piece of code for Http Post works fine if i execute it
in Visual Studio 8.0 in an Console Application.
Whereas if i execute the same code in a window service it gave me
following error:

System.Net.WebException:Unable to connect to remote server.
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.

The code is as follows:

            string url = "some url";
            Uri uri = new Uri(url);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create
(uri);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.Proxy = WebRequest.DefaultWebProxy;
            request.Proxy.Credentials =
CredentialCache.DefaultCredentials;
            try
            {
                using (Stream writeStream = request.GetRequestStream
())
                {
                    UTF8Encoding encoding = new UTF8Encoding();
                    byte[] bytes = encoding.GetBytes("CA761232");
                    writeStream.Write(bytes, 0, bytes.Length);
                }
            }
            catch (Exception ex)
            {
                Logger.Current.Error(ex.ToString());
            }

            string result = string.Empty;
            try
            {
                using (HttpWebResponse response = (HttpWebResponse)
request.GetResponse())
                {
                    using (Stream responseStream =
response.GetResponseStream())
                    {
                        using (StreamReader readStream = new
StreamReader(responseStream, Encoding.UTF8))
                        {
                            result = readStream.ReadToEnd();
                        }
                    }
                }
                Logger.Current.Info("Output recieved from service as:
" + result);
            }
            catch (Exception ex)
            {
                Logger.Current.Error("Error while receiving: " +
ex.Message);
                Logger.Current.Error("Error: " + ex.StackTrace);
            }

Please reply me as earliest as i had put a lot of head already in
that.....

Thanks in advance
Deepu