Currently configured authentication provider? XP documentation?

Still no resolution to how can I set the Remote Access "currently configured
authentication provider". The closest I've been able to find is some
references to Windows 2000 Internet Authentication Service(IAS). One would
think Microsoft would have this documented somewhere. I found the same two
error message on a German site but unfortunately I can't read German so I
don't know if they were ever resolved.



Remote Access:

Authentication provider failed

The currently configured authentication provider failed to load
and initialize successfully.



The specified procedure could not be found.



Service Control Manager:

The Routing and Remote Access service terminated with service-
specific error 127 (0x7F).