NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference.
Questions tagged [ntp]
717 questions
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NTP synchronisation not visible in syslog
I am trying to set up a local NTP server for our LAN. I am able run ntpdate server_ip to manually update the time. However, ntp daemon does not seem to be logging anything into syslog, and so I can't tell if any system ever synchronized.
#…
Prateek Bhatt
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Pinpointing source of clock inaccuracy
I am having a huge problem with the clock on a Windows XP machine. Whether getting its time from the domain controller using w32time and an ntp server (PDC) / client, from a GPS clock directly using meinberg NTP client (ethernet), or the computer's…
prelic
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Manually syncing comp clock with DC works, but after a minute - clock incorrect by 5 minutes
The problem:
DC1 Clock: 17:23
AD joined client clock: 17:28
After client> w32tm /resync time is in sync, but the clock again jumps forward for 5 minutes for client. It always happens in less than a minute.
Ok, maybe syncing from somwhere else. I…
Janis Veinbergs
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NTP synchronization stays with no reach
Usually, when a machine looses connection completely, ntpd misses a couple polls and marks all sources as failed sanity. Which seems quite logical. But I've met a situation when a server stays marked as current time source while its reach turned…
akalenuk
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NTP server script
How can I synchronize a windows PC time to a NTP server using a batch script?
Martin Delille
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Nagios: check services being orphaned?
Recently I noticed that there are some warnings in the nagios.log:
[1366060611] Warning: The check of service 'pt-deadlock-logger' on host 'xx' looks like it was orphaned (results never came back). I'm scheduling an immediate check of the…
quanta
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CentOS VM, NTP synchronization problems
We have three CentOS 5.9 VMs on an ESX3.5 host.
Because of the nature of the services we provide it is required that the NTP time is synchronized and the time is correct on all three of them.
However one of them constantly drifts back each day for…
Spirit
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Security issues with NTPD
I want to sync some two dozen Linux servers which are spread all over the world. I was thinking about using NTPD, but I want to know the security implications of using it: Is there a possible vulnerability? Should I sync them to a local server and…
Adam Matan
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using NTP protocol for internal time synchronisation
I have two embedded system that are connected via ethernet. I want them to run synchronously. Using NTP protocol is an option to synchronize them. But this is a isolated system. I don't have an Internet connection. Is it possible to use ntp protocol…
zontragon
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Real-time clock is wrong (from hours to years), one-time non-monotonic change at boot needed. Can Chrony solve this?
I can't guarantee a sane real-time clock on some machines (the time might be wrong by hours, months or even years). Since I also have intermittent networking, I set up Chrony in the hopes it could fix the issue.
But it seems that Chrony wants to…
darque
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Using meinberg ntp over 40Km wireless network
We have a network of 10 clients running Windows XP with meinberg ntp. Clients are syncing with two ntp servers over a 40Km wireless network using mikrotik devices. Some of clients are connecting to ntp servers over a hop to hop links. ntp servers…
Majid Azimi
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Time issues on the Network -- How to find the Root Cause
A number of application servers started erroring out in my domain. Troubleshooting led me to a missconfiguration of NTP. I fixed the issue, but I don't know how the issue arose in the first place.
The only errors I can find are
System Error:…
Jeff
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Crazy VM clock drift
This is taken from an Ubuntu 10.10 VM running on ESX5:
Nov 3 21:58:50 server1 ntpd[21169]: adjusting local clock by 31.187370s
Nov 3 22:02:36 server1 ntpd[21169]: adjusting local clock by 31.159808s
Nov 3 22:05:18 server1 ntpd[21169]: adjusting…
SimonJGreen
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Adjust frequency of Windows Time sync
On Windows 2003 it is possible via the registry to set a custom interval for updates.
This is done via the following registry key:
HKLM\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient\SpecialPollInterval
After adjusting this key…
neildeadman
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Is there any way to make ntpd to iteratively consult the server addresses given in the ntp.conf file?
Suppose the machine has an ntp.conf file that looks like this:
driftfile
server
server
server
For some reason, let us say that the NTP server is not running at the first query to…
Arpith
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