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Sometimes I get the following error while I was doing HttpWebRequest to a WebService. I copied my code below too. System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:80 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception) --- End of inner exception stack trace --- at System.Net.HttpWebRequest.GetRequestStream() ServicePointManager.CertificatePolicy = new TrustAllCertificatePolicy(); HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.PreAuthenticate = true; request.Credentials = networkCredential(sla); request.Method = WebRequestMethods.Http.Post; request.ContentType = "application/x-www-form-urlencoded"; request.Timeout = v_Timeout * 1000; if (url.IndexOf("asmx") > 0 && parStartIndex > 0) { AppHelper.Logger.Append("#############" + sla.ServiceName); using (StreamWriter reqWriter = new StreamWriter(request.GetRequestStream())) { while (true) { int index01 = parList.Length; int index02 = parList.IndexOf("="); if (parList.IndexOf("&") > 0) index01 = parList.IndexOf("&"); string parName = parList.Substring(0, index02); string parValue = parList.Substring(index02 + 1, index01 - index02 - 1); reqWriter.Write("{0}={1}", HttpUtility.UrlEncode(parName), HttpUtility.UrlEncode(parValue)); if (index01 == parList.Length) break; req

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