can't syncronize ntp

[aviv2]

hi guys, i have server 2012 with ntp service,
on ubuntu if have configured /etc/ntp.conf , i have added my server
and i can see it with the command ntpq -p

remote refid st t when poll reach delay offset jitter
================================================== ============================
server2012dom.a .LOCL. 1 u 47 64 377 0.408 0.872 8.676

i have tried
sudo ntpdate -u 192.168.16.207
sudo ntpdate -s 192.168.16.207

restart the service and reboot the computer
the date remain the same as he was,
any solution?
10x

[ian-weisser]

Try it with the -d flag for debugging mode.
Try it without the -s flag so output is to the screen instead of log.

[SeijiSensei]

You also need to write the timestamp to the hardware clock after updating. NTP only updates the system time, not the hardware clock. To do that, run the command

sudo hwclock --systohc

after running ntpdate.

If you run ntpdate and then use the "date" command, is the time updated? If so, then the problem is the hardware clock.

[nerdtron]

sudo ntpq -c lpeer

Show which NTP servers the machine is contacting. * symbol before the server means the local machine is currently syncing on this server.

ntpdate ntp_server_IPaddress

If the time difference from an NTP server to your local machine is too great (e.i. more than 30 mins) ntp service can take a long time to synchronize their times.
To synchronize quickly, use ntpdate.


Stop the ntp service, because you can't use ntpdate while ntp service is running.

sudo service ntp stop

Run ntpdate at least 3 times and you'll see that time adjustment it made.

ntpdate ntp_server_IPaddress

Run the ntp service again

sudo service ntp start

After a few minutes, try checking the ntp peer on which your machine is synced.

sudo ntpq -c lpeer

[HermanAB]

Howdy,
If the time difference between the computer and the NTP server is very different, then the NTP client will refuse to change the clock. The ntpdate command however doesn't have any such protection.

[aviv2]

the main server that run ntp is server 2012 running on vmware so how can if fix hardware clock problem?
the server date and time is exact as the physical computer he has installed.
when i syncronize xp ,7 or any microsoft vmware with the server there is no problem, its only on ubuntu, i have only just one ubuntu that sync as exact time as my real machine.

i have typed the command
sudo hwclock --systohc



i have turn of the UTC on /etc/default/rcS , still the saem

[SeijiSensei]

As I asked earlier

If you run ntpdate and then use the "date" command, is the time updated?

Is UDP port 123 open on all these machines? Firewalls?

[aviv2]

i can't understand the syntax ntpdate date, how?
there is no firewall on the server , on windows xp it works.

[SeijiSensei]

i can't understand the syntax ntpdate date, how?

[Seiji@GhostWorld ~]$ sudo ntpdate 0.centos.pool.ntp.org
21 Aug 13:30:39 ntpdate[31482]: adjust time server 199.102.46.75 offset -0.003638 sec
[Seiji@GhostWorld ~]$ date
Thu Aug 21 13:30:49 EDT 2014

[SeijiSensei]

As I asked earlier

If you run ntpdate and then use the "date" command, is the time updated?