FreeRadius not responding to a remote machine

[Dusty Doris]

> But I am not able to connect to the freeradius from a remote machine
> runs on Linux. I have configured the remote machine in the
> clients.conf file and ran the server on debug mode. But the server is
> not showing any trace of getting a connection from the server. I even
> tried to connnect to the server from a windows XP machine using a
> utility called NTRadPing. But it also behaves the same way.

Firewall or routing.