VB.NET: Get an external website

I am trying to get a page of an external website's HTML into a variable.

Here is the code
Public Shared Function GetPageText(ByVal url As String) As String
 
        Dim request As HttpWebRequest = WebRequest.Create(url)
         request.Timeout = 20000
             Using response As HttpWebResponse = request.GetResponse()
                   Using streamIP As Stream = response.GetResponseStream()
                              Using readerText As New StreamReader(streamIP)
                                                Dim htmlText As String = readerText.ReadToEnd()
                            Return htmlText
                End Using
            End Using
        End Using
    End Function



here is the error it returns:
The remote server returned an error: (406) Not Acceptable.  

The break occurs at this line:    Using response As HttpWebResponse = request.GetResponse()

Any ideas?