This is don't really follow or undestand, but its not relevant to
> Other IP addresses for the WinNT machine are 126.96.36.199, 188.8.131.52
> and 184.108.40.206
> The NAS is located at 220.127.116.11 and is configured to talk to the
> RadiusNT server at 18.104.22.168 .
No problems here.
> The NT machine receives the radius request fine and the ID is confirmed
> back to the NAS. This works for security only. When I try to use
> accounting, the NAS never acknowledges the ack sent by the RadiusNT machine.
Have you tried enabling the "Require secret" option for
accounting? This could be all you need for accounting