Whenever I try to remote control a computer running Windows XP Professional I get a dialog box asking me to authenticate. I don't get this box when I remote control my Windows 2000 or NT servers.

Does anybody out there know how to stop the dialog box from coming up?

Contributed By: Russ Wilson [MS]
This is generally because the admin account you are using does not have permissions to remote control the client (that is, is not in the Permitted Viewers list) or the incoming account cannot be authenticated by the XP Professional machine.

Is this client assigned to the same site where you are invoking remote control? I presume it is, but if not it could be receiving different config information. Check the SMS control panel applet for the assigned site.

Is the XP Pro machine a member of the same domain as the site server, indeed is it part of the domain at all? This is the most likely source of the problem.