Ok so after 6 months I have solved this problem! It was several things, the other server (A Webmethods Integration Server) is a little picky about what kinds of protocols it accepts. So after some fiddling around here are the two things that fixed it: ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; and req.ProtocolVersion = HttpVersion.Version10; So the whole code is: ServicePointManager.Expect100Continue = true; ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://websiteURL:9000"); //Header Settings req.Method = "POST"; // Post method req.ContentType = "text/xml";// content type req.KeepAlive = false; req.ProtocolVersion = HttpVersion.Version10; //Certificate with private key X509Certificate2 cert = new X509Certificate2("Cert.der","Password"); req.ClientCertificates.Add(cert); req.PreAuthenticate = true; String XML = "Test Message"//reader.ReadToEnd(); byte[] buffer = Encoding.ASCII.GetBytes(XML); req.ContentLength = buffer.Length; // Wrap the request stream with a text-based writer Stream writer = req.GetRequestStream(); // Write the XML text into the stream writer.Write(buffer, 0, buffer.Length); writer.Close(); WebResponse rsp = req.GetResponse(); StreamReader responseStream = new StreamReader(rsp.GetResponseStream()); Hope this helps someone else in the future. |
