Capturing a Client Cert and Passing it to a Secure Web Service

[hepsubah]

I'm trying to capture a client cert in my ASP.NET application, and use
that cert as the client cert for a call to secure web service.

I've used the following code, but am getting a 403 error on the
invocation of the service. All the service is supposed to do is
return the subject of the passed cert (I'll do more with it later)

-----------------------------------------------------------------------------------------------------------------------------------------
protected void Page_Load(objec t sender, EventArgs e)
{
// Capture Client Certificate
HttpClientCerti ficate cs = Request.ClientC ertificate;
string svcres;

try
{

// Create X509 Cert from Client Cert
X509Certificate x509 = new
X509Certificate (cs.Certificate );

// Instantiate the Servive
TestCertService .Service ts = new
TestCertService .Service();

// Add the Captured Cert
ts.ClientCertif icates.Add(x509 );

// Invoke the Service
svcres = ts.CertSubject( );

Response.Write( "<br><br><br>Ce rt from Service<br>");

Response.Write( "-------------------------------------------------------
<br>");
Response.Write( "Subject = " + svcres + "<br>");
}
catch (Exception ex)
{
if (ex is WebException)
{
WebException we = ex as WebException;

Response.Write( "WebError Invoking Service = Message:"
+ we.Message + "<br>");
}
else
{
Response.Write( "Error Invoking Service = Message:" +
ex.Message + "<br>");
}
}
-------------------------------------------------------------------------------------------------------------------------------------------------

Is this approach sound?

Is this a security issue?

Any help would be appreciated