Hi Steve,

Is it possible that the server with the schemas only allows Integrated 
Security? If the web server is running IIS, go to the IIS MMC, open the 
properties for your website, click on the Directory Security Tab and click 
Edit. Make sure that both Basic and Integrated Security are on.

Basic authentication is a security mechanism where user names and passwords 
are sent as clear text (more or less) over the wire. It' s used by all 
browsers and therefore very convenient for the Internet. In Integrated 
Security, not the password itself is transferred, but only a hash. There is 
no way you can transform the hash in the password back again so this is 
considered a pretty secure alternative.

The fact that your browser can see the schemas backs up this point. You are 
logged on to your machine, so the hash of your user name and password is 
sent silently behind the scenes to the remote host.

I suggest you read a bit about "basic authentication" Vs "Integrated 
Windows Authentication" before you open your webserver to the Internet.

The following document shows some basic info about both security 
mechanisms, but there is a lot more info available on MSDN.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnw2kmag00/html/iis5auth.asp

HtH

Imar




At 06:46 PM 12/3/2002 +0000, you wrote:
>I have this problem. We have some schemas on a server that are protected
>by a username and password. I can see them from IE on problem. When I try
>to validate an XML Document using the Schemas with an xmlValidatingReader
>I receive error "The remote server returned an error: (401) Unauthorized."
>So I tried a different approach using the code below.
>
>Imports System.Net
>Imports System.IO
>
>Module Module1
>
>Sub Main()
>
>Dim c As New CredentialCache()
>Dim x As HttpWebRequest
>Dim u As New Uri("http://OurSchemas.gov.uk/transactions/transactions.xsd")
>Dim s As Stream
>
>c.Add(u, "Basic", New System.Net.NetworkCredential("User", "Password"))
>
>x = WebRequest.Create(u)
>x.Credentials = c
>x.PreAuthenticate = True
>
>Dim resp As WebResponse
>resp = x.GetResponse()
>
>Console.ReadLine()
>
>End Sub
>
>End Module
>
>Again I received the same Error when I try to get a response. So my
>question is, has  anyone else had this problem? And if so, How did you
>solve it?
>Also Does anyone know what Basic is in the above code.
>
>Thanks In advance
>
>Steve.