Client certificate ???

From: Edvin (edvin@mobifrik.com)
Date: 01/23/03 

From: "Edvin" <edvin@mobifrik.com>
Date: Thu, 23 Jan 2003 06:34:57 -0800

Hi everybody.

I'm trying to access web page which requires client
certificate with HttpWebRequest class.
Simplified function code looks like this:

void DoHtttpPost(...)
{
...
HttpWebRequest oRequest=(HttpWebRequest)WebRequest.Create
("https://....");
X509Certificate oCert = X509Certificate.CreateFromCertFile
(@"d:\cert\aaa.cer");
oRequest.ClientCertificates.Add(oCert);
Stream oInStream=oRequest.GetRequestStream();
....
}

When I tried this function in .NET Windows form
application it works OK. But if I try to call the same
function inside .NET ASP aplication I get Exception "The
remote server returned an error: (403) Forbidden."

Any idea what is going wrong....
Thanks,
Edvin