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cisco router didn't synchronized with ntp server

hello experts
I can't get Cisco router synchronized with the ntp server.

#show run | in ntp
ntp source Vlan1
ntp server
ntp server

#show ntp associations
  address         ref clock       st   when   poll reach  delay  offset   disp
 ~ .INIT.          16      -   1024     0  0.000   0.000 15937.
 ~  .INIT.          16      -   1024     0  0.000   0.000 15937.
 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured

#show ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 249.9433 Hz, actual freq is 249.9433 Hz, precision is 2**16
reference time is 00000000.00000000 (23:59:00.000 MSD Mon Jan 1 1900)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 1.03 msec, peer dispersion is 0.00 msec
loopfilter state is 'FSET' (Drift set from file), drift is 0.000000000 s/s
system poll interval is 64, never updated.
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1 Solution
AkinsdNetwork AdministratorCommented:
Can you ping the ntp server (I can't ping it from my end)
Are the addresses valid or just not responding to pings

If yes
Is there any firewall policy blocking port 123
I'm assuming you have

Stratum 16?
That's too many generations -

Try linking to one of these Open Access Stratum servers closest to you.

I use these 2
ameriaadminAuthor Commented: and my local ntp servers. access permitted for clients.
AkinsdNetwork AdministratorCommented:

I see your ntp servers have private IPs.

In your question, you typed
ntp server
ntp server
Both addresses are public addresses

In your reply, you typed private addresses and

Which is the correct IP?

Looks like you may have typed the wrong ip address when configuring the ntp on your router.
ameriaadminAuthor Commented:
I have coped and paste, but I don't know why it shows 195. my addresses are
and It is right in my configs.
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