Our users are in-house MSAD users, while Knowledge Center is hosted by an external provider. The techies are a bit flummoxed and try to tell us our software should accomplish this while we think there ought to be a back-end solution. We have to get the domains talking to each other somehow but they would be communicating across the Internet so all sorts of security considerations are surely involved. Server/network/domain configuration? Third-party software? Has anyone come across this situation? What's the best way to get Knowledge Center to recognise and authenticate MSAD users on Domain X while Knowledge Center itself sits on Domain Y?