Hello.  This should be easy, but for some reason it is not....

Background: trying to configure NTP on a core switch.  Edge ASA has NTP configured on it and it is working.

Issue:  I cannot get core switch to synch NTP with either the ASA or the same NTP source ASA uses.

Configuration on ASA:

ntp server 192.5.41.41 source OUTSIDE prefer

ASA# sh ntp stat
Clock is synchronized, stratum 2, reference is 192.5.41.41
nominal freq is 99.9984 Hz, actual freq is 100.0041 Hz, precision is 2**6
reference time is d04366ba.734ec938 (11:15:38.450 mdt Tue Sep 21 2010)
clock offset is -17.3707 msec, root delay is 56.08 msec
root dispersion is 36.09 msec, peer dispersion is 18.28 msec

ASA# sh ntp ass
      address         ref clock     st  when  poll reach  delay  offset    disp
*~192.5.41.41      .USNO.            1     6    64  377    56.4  -16.30    17.2
* master (synced), # master (unsynced), + selected, - candidate, ~ configured

Configuration on switch (directly connected to ASA):

ntp server 192.5.41.41 source GigabitEthernet6/1 prefer

4510#sh ntp stat
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18
reference time is D04363C5.AAFFBC27 (11:03:01.667 MDT Tue Sep 21 2010)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.02 msec, peer dispersion is 0.02 msec

4510#sh ntp ass

      address         ref clock     st  when  poll reach  delay  offset    disp
~192.5.41.41      0.0.0.0          16     -    64    0     0.0    0.00  16000.
* master (synced), # master (unsynced), + selected, - candidate, ~ configured

I have tried using ASA as the NTP source as well with no results.  Suggestions?

Thanks, Patrick