Client Certificates problem

Hi,

I'm having a problem with client certificates - I can't get it to work.
Below is my code - the URL is valid, as is the certificate path. I've
viewed the certificate properties and it appears valid - yet I just get
"403 - Forbidden" when I try to connect. My provider made client
certificates mandatory last night, so I am very sure that this is the
problem.

Is there anything obvious I missed?

Dino


---------------------------
HttpWebRequest httpWebRequest = (HttpWebRequest) WebRequest.Create(url);
ServicePointManager.ServerCertificateValidationCallback =
this.ValidateServerCertificate;

X509Certificate certificate =
X509Certificate.CreateFromCertFile(fullPath);
httpWebRequest.ClientCertificates.Add(certificate);

// Set the 'Method' property of the 'Webrequest' to 'POST'.
httpWebRequest.Method = "POST";

// Set the content type of the data being posted.
httpWebRequest.ContentType = "multipart/form-data";

// Set the content length of the string being posted.
httpWebRequest.ContentLength = 0;

HttpWebResponse httpWebResponse;

try
{
        // Make the request
        httpWebResponse = (HttpWebResponse)
httpWebRequest.GetResponse();
}
catch (WebException)
{
    if (processing)
        throw;

    processing = true;
    Thread.Sleep(5000);
    return this.ProcessData(data, baseData);
}
catch (Exception ex)
{
        GC.KeepAlive(ex);
        throw;
}

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