I've just installed a fresh copy of NPS on a new 2008 R2 Std server. When I go to add a Radius client, I get "NPS Error: The service being accessed is licensed for a particular number of connections. No more connections can be made to the service at this time because there are already as many connections as the service can accept. (Exception from HRESULT: 0x80070573)".
What do I do? This is the first Radius client I am installing (and the first change to the vanilla NPS since running the role installation wizard) so obviously I have not hit the 50 client max.