>

>Dim TUcert As X509Certificate = X509Certificate.CreateFromCertFile(mcCertFile)
>.
>.
>oRequest.ClientCertificates.Add(TUCert)
>.
>.
>oRequest.GetResponse()
>

Joe,

What you've described sounds rather complex to me, an outsider to your issue. However, I ran into something similar when accessing a secured web service, I was receiving error 403 access denied. In the end I found out that the cause of the problem was that my request wasn't accepting cookies. Are you using HttpWebRequest, if so, below is what fixed my problem:

oRequest.CookieContainer = New CookieContainer()

Hope this helps,