IIS 6 Authentication - Active Directory

[Guest]

I was developed an ASP.NET application using the authentication method
descripted in the folowing url
[URL: http://support.microsoft.com/default.aspx?scid=kb;en-us;326340
HOW TO: Authenticate against the Active Directory by Using Forms
Authentication and Visual Basic .NET]

evrething works fine in IIS 5 but when i deploy the application in Windows
2003 server with IIS 6 this method does not work anymore.

How must configure IIS 6 to work with the above method?

thanks.