It is the first time I have to use certificate authentication. A commercial partner expose two services, a XML Web Service and a HTTP service. I have to access both of them with .NET clients.

What I have tried

0. Setting up the environment

I have installed the SSLCACertificates (on root and two intermediate) and the client certificate in my local machine (win 7 professional) using certmgr.exe.

1. For the web service

• I have the client certificate (der).
• The service will be consumed via a .NET proxy.

Here's the code:

OrderWSService proxy = new OrderWSService();
string CertFile = "ClientCert_DER.cer";

proxy.ClientCertificates.Add(new System.Security.Cryptography.X509Certificates.X509Certificate(CertFile));
orderTrackingTO ot = new orderTrackingTO() { order_id = "80", tracking_id = "82", status = stateOrderType.IN_PREPARATION };
resultResponseTO res = proxy.insertOrderTracking(ot);

Exception reported at last statement: The request failed with an empty response.

2. For the HTTP interface

• it is a HTTPS interface I have to call through POST method.
• The HTTPS request will be send from a .NET client using HTTPWebRequest.

Here's the code:

string PostData = "MyPostData";

//setting the request
HttpWebRequest req;
req = (HttpWebRequest)HttpWebRequest.Create(url);
req.UserAgent = "MyUserAgent";
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ClientCertificates.Add(new System.Security.Cryptography.X509Certificates.X509Certificate(CertFile, "MyPassword")); 

//setting the request content
byte[] byteArray = Encoding.UTF8.GetBytes(PostData);
Stream dataStream = req.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();

//obtaining the response
WebResponse res = req.GetResponse();
r = new StreamReader(res.GetResponseStream());

Exception reported at last statement: The request was aborted: Could not create SSL/TLS secure channel.

3. Last try: using the browser

In Chrome, after installing the certificates, if I try to access both urls I get a 107 error:

Error 107 (net::ERR_SSL_PROTOCOL_ERROR)

I am stuck.