[pptp-server] PPP Authentication not working

[Steve Cody]

I have PoPToP set up on a Redhat Linux 6.2 system.  My user authentication
is not working for PPP.  I have to put NOAUTH on the server so users can
connect.  I NEED to at least have password authentication for security.
Right now, I have to block all PPTP traffic, and explicitly allow users in
through the firewall as they need VPN access.

Where do I look?

Thanks!

Steve Cody