Help with HTTPWebRequest and client certificates

[nomad]

Hi,

I am using HTTPWebRequest to add a client certificate. I am then
using HTTPWebRequest to POST xml to a web service which requires the
attached client certificate to authenticate with their server
certificate. However, I keep getting an error "Unable to connect to
remote server". I know I am able to connect to their server and
retrieve an XML response as we were able to do this using our old
solution (WinHTTP in Visual Basic 6). I have read many articles and
some of them have mentioned ignoring all certificate errors which I am
also doing but with no luck. If anyone has any suggestion it would be
greatly appreciated. The code to add the certificate is below.

webRequest.Clie ntCertificates. Add(GetCertific ate());

private X509Certificate GetCertificate( )
{
///Set store to LocalMachine as this is where the
certificates must be installed
X509Store store = new X509Store(Store Name.My,
StoreLocation.L ocalMachine);
store.Open(Open Flags.ReadOnly) ;
//Find certificate based on it's name
X509Certificate 2Collection certificates =
store.Certifica tes.Find(X509Fi ndType.FindBySu bjectName, this.sslName,
true);
return certificates[0];


}

The code to ignore certificate errors is below:

ServicePointMan ager.ServerCert ificateValidati onCallback =
new
RemoteCertifica teValidationCal lback(IgnoreCer tificateErrorHa ndler);

private bool IgnoreCertifica teErrorHandler( object sender,
X509Certificate certificate,
X509Chain chain,
SslPolicyErrors sslPolicyErrors )
{
//I would log a Information Error so we know if partner
site is iffy on the security side
//But for now, as simple skip error will do
return true;
}

Sending the XML is below. It fails on using (Stream os =
this.webRequest .GetRequestStre am())

public string Send(string dataToSend)
{
//Convert our string to a byte array
byte[] bytes = Encoding.ASCII. GetBytes(dataTo Send);
this.webRequest .ContentLength = bytes.Length;

//write bytes to server
using (Stream os = this.webRequest .GetRequestStre am())
{
os.Write(bytes, 0, bytes.Length);
}

//Get the response
WebResponse webResponse = webRequest.GetR esponse();

if (webResponse != null)
{
using (webResponse)
{
using (StreamReader sr = new
StreamReader(we bResponse.GetRe sponseStream(), Encoding.Defaul t))
{
//return the data as string
return sr.ReadToEnd(). Trim();
}
}
}
else //we got no response, we return null
{
return null;
}

}


Thanks