Yahoo Intellisync fails when behind MN-700

When syncing Yahoo Intellisync (that worked up until I
installed the MN-700), it fails. WHen I log into the MN-
700 and put my IP address into the DMZ, all is well. Why
is the MN-700 blocking Yahoo Intellisync (which doesn't
use any special 'ports' to my knowledge)???

Install the free ZoneAlarm firewall on the the PC, turn
on the DMZ, run Intellisync, and see which ports are
used. Remove ZoneAlarm and the DMZ, and open the ports
used by Intellisync

>-----Original Message-----
>When syncing Yahoo Intellisync (that worked up until I
>installed the MN-700), it fails. WHen I log into the MN-
>700 and put my IP address into the DMZ, all is well. Why
>is the MN-700 blocking Yahoo Intellisync (which doesn't
>use any special 'ports' to my knowledge)???
>
>.
>