Can't connect to remote freeradius server

I've installed freeradius 1.1.5 and am able to run radtest successfully on the machine that freeradius is installed on. However, when I try to run radtest (or NTRadPing or radius test client) it is unable to connect to the server. Does anyone have any ideas? I do have the servers I'm running radtest on listed in clients.conf Here is the output from NTRadPing (IP address removed by me): Sending authentication request to server XX.XXX.XXX.XXX:1812 Transmitting packet, code=1 id=0 length=67 recvfrom() error, WSAGetLastError() = 10054 could not receive a response from the server Any suggestions would be appreciated.