client certificate for WCF

I have defined a web client for an external web SOAP service secured by a certificate and user name and password.

I want to use the following code to instantiate the web client and set the credential for the client.

            ws1 = New CDPHService.CDPH_transferPortTypeClient(contractName, EndPoint)

        Try

            ws1.ClientCredentials.ClientCertificate.SetCertificate( _
                System.Security.Cryptography.X509Certificates.StoreLocation.CurrentUser, _
                System.Security.Cryptography.X509Certificates.StoreName.My, _
                System.Security.Cryptography.X509Certificates.X509FindType.FindByApplicationPolicy, _
                "cdph")
        Catch ex As Exception
            MsgBox("set certificate error " + Err.Number.ToString + Chr(10) + ex.Message)
        End Try

This system is running Windows 8.1 Pro,  I am developing in Visual Basic with Visual Studio 2012.  The application references .Net Framework 4

Windows 8.1 certificate manager shows the certificate with the friendly name "cdph"

The MSDN reference for X509FindType.FindByApplicationPolicy states specifically that FindByApplicationPolicy wants a string with the application policy friendly name.  ( http://msdn.microsoft.com/en-us/library/system.security.cryptography.x509certificates.x509findtype(v=vs.110).aspx)

When the SetCertificate statement is executed, it returns error 5 The OID value was invalid.

Why would that error be generated? Or more generally - why isn't the certificate being found?

Jim

LIMS Consultant

BtB Software