Download File with ServerXMLHTTP with setProxyCredentials

I am trying to run a VBScrpit to download a file daily from a website. In order to do this I need to set the proxy credentials. THe scrpit below works inside the network, and I have verified that the two URLs are accurate (if put in IE both go where I want) but after I enter my proxy credentials and do a .send the object status returns HTTP Error 407 (proxy authorization required) I know that the credentials I have are what I enter manually, although I reliase that it may not be the full username. Also I cant bypass the proxy because the website verifies the IP address before allowing me to login.  Any suggestions?  

Dim sFileURL, objXMLHTTP, objADOStream, objFSO, sLocation,  username, password,url
     
 username = "my username"
 password = "my password"
 sFileURL = "Login URL"
 sLocation = "Path" 
 url = "File URL"
 
Set objXMLHTTP = CreateObject("MSXML2.ServerXMLHTTP.6.0")

 objXMLHTTP.setProxy 2, "my proxy"   
 objXMLHTTP.Open "GET", sFileURL, False 
 objXMLHTTP.setProxyCredentials username, password
 objXMLHTTP.send()
 
If objXMLHTTP.Status <> 200 Then    
	msgbox objXMLHTTP.status 
End if 
 
objXMLHTTP.Open "GET", url, False
objXMLHTTP.send()

If objXMLHTTP.Status = 200 Then
 
        Set objADOStream = CreateObject("ADODB.Stream")
        objADOStream.Open
 
        objADOStream.Type = 1
        objADOStream.Write objXMLHTTP.ResponseBody
 
        objADOStream.Position = 0
 
        Set objFSO = CreateObject
                     ("Scripting.FileSystemObject")
 
         If objFSO.FileExists(sLocation) Then 
                      objFSO.DeleteFile sLocation
 
        
         Set objFSO = Nothing
 
        
         objADOStream.SaveToFile sLocation
 
         objADOStream.Close
  
         Set objADOStream = Nothing
 
End If
 
Set objXMLHTTP = Nothing

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