limiting rras vpn connection to one connection per user on windows 2008 R2

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http://serverfault.com – The problem is: users can connect (vpn) multiple times using same username & password. It's a Windows 2008 R2 server, without AD. I want to limit them to one vpn connection per username. I need something like logonlimit that works on win2008. I know there are 3rd party apps like: UserLock I have no idea if I can do this using NPS or not? Any answer that can put me in the right direction is appreciated. (HowTos)