[SOLVED] NTP-Server & Firewall port settings:

I need a little help with this one please?

I've been using the NTP-Server add-on on my Duo v.1. for many months now. It serves my Linux boxes beautifully.

Anyway, the problem(?):

I just modified the IPTables firewall on a Linux box using gufw, a GUI front end for ufw, which is to the best of my understanding a simplified command line front end for IPTables. After rebooting, everything works very fine, see below (the following was taken immediately after the machine booted):

[handy@jarmano ~]$ time
Local time: Tue 2013-03-05 16:28:04 EST
Universal time: Tue 2013-03-05 05:28:04 UTC
RTC time: Tue 2013-03-05 05:28:04
Timezone: Australia/Sydney (EST, +1100)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: yes
Last DST change: DST began at
Sun 2012-10-07 01:59:59 EST
Sun 2012-10-07 03:00:00 EST
Next DST change: DST ends (the clock jumps one hour backwards) at
Sun 2013-04-07 02:59:59 EST
Sun 2013-04-07 02:00:00 EST
remote refid st t when poll reach delay offset jitter
==============================================================================
192.168.1.15 .XFAC. 16 u - 128 0 0.000 0.000 0.000
[handy@jarmano ~]$

But the time server stalls my machine for a 90 seconds, before moving on when booting?

Do I have to enable port 123? Do I need to do more than enabling port 123 in the firewall?

Thank you for your time, & please excuse me for invading it?