NW6 and OS X.3.x environment

NFA has worked well since Sept. For the last week we are finding that
users who use PC and MACs during the day are no longer able to login due
to "too many simultaneous connections". We limit users to one connection
to prevent account sharing. We prefer to maintain this setting.

We do not find the user's connetion in 'monitor'. Unloading AFPTCP does
not help either.

We find mixed results when we look at the users account settings,
sometimes an address(IP) will be listed in the network address field
sometimes it will be blank.

Any input is appreciated