XMLHTTP object & SSL certificate issue

Hi
I've got a problem with a function which is used to retrieve a file off a server. The server has SSL encryption, however the certificate is not issues by a "trusted company" - or atleast this is the alert I receive when attempting to manually access the file.

The error I get when trying to execute my script:

msxml3.dll error '80072f0d'

The certificate authority is invalid or incorrect



I've researched the subject and found the XMLHTTP setOption method can override the handling of the certificate issue, but I have not been able to get it working.

The script:

Function GetDBfile( GroupID )

      dim strFcontent
      dim xml, newopt

      set xml= CreateObject("Msxml2.ServerXMLHTTP")
      xml.Open "GET",url,False
      newopt = (xml.getOption(2) - 13056)
      xml.setOption(2) = newopt
      xml.Send
      strFContent = xml.ResponseBody
      xml.Close
      set xml=Nothing

      With CreateObject("ADODB.Stream")
      .Type = 1
      .Open
      .Write strFContent
      .SaveToFile Server.MapPath("files/db/"& GroupID &".txt"),2
      End With
      
      GetDBFile = True

End Function

Any ideas?
Thanks in advance.