http://www.howtogeek.com/howto/windows/command-line-hack-for-terminal-server-has-exceeded-the-maximum-number-of-allowed-connections/

First Query: 

 query session /server:servername

Second Terminate:

reset session [ID] /server:servername

This is a good article to configure a router as a switch. It would be better to get a cheaper switch, but if you have any old routers not used, here is a way to use it as a switch.

http://kb.netgear.com/app/answers/detail/a_id/965