tip busy problem

[Keith Rich]

I recently noticed a problem with tip on a BSD4.3 system.
It tells me "all ports busy" unless I am root.  It wasn't
always this way, so I suspect I mis-configured something.
I've checked the ownership (uucp/daemon) and permissions
(666) on the tty in question and they seem to be in order.
The port works correctly for uucico transfers and there
are no outstanding locks in /usr/spool/uucp.

Can anyone suggest where I should look to isolate the problem?

Thanks,  Keith Rich - keith at imagen.com