using two httpWebRequest with the same cookies

Hi,

I’ve seen a lots of posting on the web but no real solution to my particular problem.

Here's what I have:

I have an application that logs onto a web site that returns me a HTTP page containing files that I need to download. This works.

My code for the first URL
   
 Dim CookieCol As CookieCollection
    Dim encoding As New System.Text.ASCIIEncoding
    Dim LoginRes As HttpWebResponse
    Dim LoginReq As HttpWebRequest
       
        Dim PostData As String = "UserID=mikec&password=xmltest&username=XML%20%Retrieval"
        Dim Data() As Byte = encoding.GetBytes(PostData)

        LoginReq = HttpWebRequest.Create(“HTTPS://mysite/logon”)

        'Initialise the request
        LoginReq.KeepAlive = True
        LoginReq.Method = "POST"
        LoginReq.ContentType = "application/x-www-form-urlencoded"
        LoginReq.ContentLength = Data.Length
        LoginReq.CookieContainer = New CookieContainer

        Dim SendReq As IO.Stream = LoginReq.GetRequestStream
        SendReq.Write(Data, 0, Data.Length)
         SendReq.Close

          LoginRes = LoginReq.GetResponse()
        'Add any returned cookies to the cookie collection
          CookieCol = LoginReq.CookieContainer.GetCookies(LoginReq.RequestUri)
     

        Dim sReader As IO.StreamReader = New IO.StreamReader(LoginRes.GetResponseStream)
        Dim HTML As String = sReader.ReadToEnd

       
I parse the HTML page that I’m redirect too and get the name of the files and then I have to download them
However  I need  to go to a different web page using the  “GET” method to have the web server send me the files.

My code for second URL:

  Dim results As MatchCollection = Regex.Matches(html, "(?<=<a.*>).*(?=</a> )", RegexOptions.IgnoreCase)

        For i As Short = 0 To results.Count - 1
            Console.WriteLine(results.Item(i).ToString)

            LoginReq = HttpWebRequest.Create("(“HTTPS://mysite/logon/getads?AdID=" & results.Item(i).ToString)

            LoginReq.CookieContainer = New CookieContainer
            LoginReq.CookieContainer.Add(CookieCol)
            Dim response As HttpWebResponse = CType(LoginReq.GetResponse(), HttpWebResponse)

            'code to save the file
        Next


Now, I know I must send the session cookie that I received back from the first URL to the second URL and I thought I was doing it correctly However I’m getting this error:  

“The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.”

Any help would be great.
Thanks
Mike Colonna