Questions tagged [ntp]

NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference.

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Windows 2019 server NTP increases memory utilisation by acquiring page table

We started with a brand new windows server 2019 datacenter edition and installed an infrastructure monitoring agent on it and strictly no other program. The machine had 8 GB of memory. As part of ...
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NTP - Disable timesyncd and enable NTP

I have installed ntp on ubuntu 16.04 but when I run timedatectl it doesn't show NTP. It shows systemd-timesyncd in the output. I ran the command sudo systemctl disable systemd-timesyncd; sudo ...
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Windows Authenticated NTP?

Is there a way to use an authentication key when configuring Windows Time to point to a NTP Server that is not part of my domain? My situation is that I'm setting up a new Active Directory forest and ...
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NTP - After how much delay would NTP select a remote server in the pool?

A selected server will be indicated by *. But how much time will this take to select a peer from the pool if ntp service is restarted? I'm trying to monitoring NTP server offset but every time i ...
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Can I use both pool and server configurations in ntp?

For a ntp demon, what happens if I have this configuation in ntp.conf: pool 0.pool.ntp.org burst iburst minpoll 4 server europe.pool.ntp.org ? How will ntp be configured? I don't know there to be ...
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ntp.conf stepout adjustments

I’ve been reading over ntp documentation and I’m not quite sure I’m wrapping my head around ‘stepout’. We have a large environment of Linux VM’s that require ‘tinker panic 0’ to be set. ntp is ...
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Centos Linux stuck in time

Has anyone seen the Linux time being stuck, it has been driving me nuts since yesterday. # date Thu Apr 2 16:35:04 UTC 2020 # date Thu Apr 2 16:35:04 UTC 2020 # date Thu Apr 2 16:35:04 UTC 2020 # ...
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NTP client not able to auto sync with server

I have connected a system with NTP client on a local network with windows system on which NTP server is running. The problem is client is not able to sync the time with server. NTP version: 4.2.8p13 (...
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Keeping Ubuntu clock in sync with another machine using NTP

Goal To synchronize the clock of machine A (Ubuntu 18.04) with the clock of machine B (Ubuntu 16.04 on local network running an NTP server - time is approx. 10 minutes ahead of real-world time). My ...
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Does Amazon manage time synchronization on ECS/Fargate containers?

I'm trying to use NTP to synchronize local time in ECS containers using the ntpdate command, but it gives me this error: ntpdate[770]: Can't adjust the time of day: Operation not permitted ...
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NTP time sync failures on Debian

This is on HypriotOS (Debian GNU/Linux 10) running on RaPi. $ timedatectl show-timesync Failed to parse bus message: Connection timed out Then do this with sudo: $ sudo timedatectl timesync-status ...
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NTPD deleting interface eno3

Our server is loosing connection one time every day and we must reboot it manualy to get the netword coming back! The only line we can see and is certainly responsible of that is this one : ntpd[1009]...
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What happens when ntp stops sync with remote ntp server and LOCAL (127.0.0.1) is also not defined in the ntp.conf

I wish to understand the scenario in which we have defined only remote servers in the /etc/ntp.conf file and we have not set the LOCAL ntp server (127.0.0.1) options. What happens in case of a ...
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Which ntp command replaces ntpdate -q?

On older systems, where ntpdate is still available, I'm able to query an NTP-Server without setting ntpdate -q pool.ntp.org and got e.g.: server 213.239.239.164, stratum 2, offset -0.001191, ...
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Can a CentOS 8 chrony client synchronize with a CentOS 7 ntp server?

Can a CentOS 8 chrony client synchronize with a CentOS 7 ntp server? By ntp server, I mean it was configured through yum installing the ntp package and not the chrony package.
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How to change time source from a LOCAL CMOS CLOCK to a Cisco router configured as a NTP master

I have a test network that I'm using for my CCNA. I am using my Cisco 2811 router as an NTP master. I think I have it configured correctly. Is there a Cisco command to see what NTP time source I am ...
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Changing ntpversion in ntpq packets

So im using ntpq Ver 4.2.8p13, and it seems the default NTP Version that it claims in packages is version 2, as shown by: root@kali:~# ntpq -c ntpversion NTP version being claimed is 2 However, when ...
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How to synchronize clocks on servers with no internet access?

I would like to synchronize the clocks on 10 Ubuntu 16.04 servers all with no internet access. Based on my internet searches, ntp does not seem to be designed for this. What is the easiest way to do ...
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Ceph Clock Skew

I want to know where I can configure the limit of skew time for my ceph monitors. Also,how does CEPH throw this clock skew error? Specifically from which file and where can I find the file so that I ...
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all my ntpd servers marked falsetick, why?

I have a set of four ntpd servers that sync time from the same stratum 1 server. But on some clients they all are marked falsetick, why? remote refid st t when poll reach delay ...
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234 views

Unable to ntp query host that I have connection to

So I have an ethernet point to point connection from my PC to a device running NTP on UDP port 123. This is what nmap shows: root@kali:~# nmap -sU mydevice PORT STATE SERVICE 123/udp open|...
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chronyd on debian could not open IPv6 NTP socket

$ sudo journalctl -fu chrony -- Logs begin at Thu 2019-11-14 03:51:16 UTC. -- Nov 22 01:46:40 miranda-ntp-server-01 chronyd[5984]: Selected source 169.254.169.123 Nov 22 02:29:29 miranda-ntp-server-01 ...
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389 views

Domain Controller Acting As NTP but using NT5DS

We are currently using a PDC setup for our domain controllers to be our NTP server but in the REGEDIT it is showing type NT5DC instead of NTP. The issue that I am having is that our non domain ...
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NTP time synchronization [closed]

I have two Linux computers connected to each other via Ethernet crossover cable. No Internet Connection! How can I make the first computer always sync to the time of the second computer? I tried ...
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timesyncd gives huge offset because the 'dest' field is wrong

I have a custom board that runs systemd's timesyncd. I've enabled it and it doesn't seem to sync the time properly. It jumps to 2044, which it's not (yet) our current year. If I set the date manually ...
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Cannot change “w32tm /query /source” from “Local CMOS Clock” on PDC Domain Controller

I am trying to reconfigure the time settings for a single DC W2K8R2 domain. The DC is not a VM. I followed the instructions on this page to the letter..... https://gooroo.io/GoorooTHINK/Article/...
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linux redhat + time on machines change after some time in spite chrony service configured

we have machines in cluster before one week we restart the chrony service , and we check the time on all machines after chrony restart time was ok on all machines after 2 days we noticed that on ...
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linux + understanding Chrony logs and conclusions from logs

we are using chrony service in order to sync linux clients to NTP server in our cluster since we get diff time between machines we enable the chrony logs to understand the reasons that machines in ...
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Centos NTP time skew alerts [duplicate]

I have a couple of NTP Stratum 2 servers, and these are in sync with a Stratum 1 GPS appliance, and also peered between them selves. I would be interested in creating a job, which will create an alert ...
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Windows 7 NTP is not working to synchronise [closed]

i have a Windows 7 SP1 PC, and i am trying to synchronising to an internal NTP Server, but is not working. IT is failed. The PC is a part of a domain and the internal server also is in the same domain....
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Chrony on RHEL7.2 can sync to windows ntp server, But Chrony on RHEL7.4 can't sync it [closed]

according to redhat link: https://access.redhat.com/solutions/3425701 we can see that - Chrony on RHEL7.2 can sync to windows ntp server, But Chrony on RHEL7.4 can't sync it. in my case we have ...
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110 views

how configure chrony in orphan mode

I have two centos servers without internet i tried to enable orphan mode so they synch with each other but still time is not synchronized between them. Find below my settings and output of commands /...
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NTP reach property equivalent for timedatectl command

The ntpq -p command returns information which includes the reach and when properties as shown in the example: remote refid st t when poll reach delay offset jitter ==========...
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selinux and ntp , dose selinux heve negative impact on ntp

we have redhat linux servers in spite chrony.conf is set correctly with the right ntp servers we see very strange behavior that time is still sync to ntp server but change from some reason we ...
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XenServer 8.0 running a NTP client in guest PVHVM VM

I would like to run a NTP client in a Xen Linux VM under XenServer (XCP-NG 8.0 to be precise). The Linux VM, Debian Stretch 9.9 (uname -a: Linux debian 4.9.0-9 amd64 #1 SMP Debian 4.9.168-1+deb9u4 (...
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885 views

Setting up an NTP server from LAN - KoD packet has inconsistent xmt/org/rec timestamps. Ignoring

I'm setting up a NTP server on my Ubuntu machine and I want my Raspberry Pi's and (eventually) Window's machines to sync from it. I thought things would be pretty straight forward, however I'm ...
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VM drifts: ntpd issues

Query shows a very outdated reftime. Also I notice "spike_detect". # ntpq -pcrv remote refid st t when poll reach delay offset jitter =========================================...
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Local GPS clock is marked as falseticker by ntpd — why?

I have a Linux NTP server with a ublox M8Q GPS module connected via GPIO (UART @ 9600bps and PPS). What I observe is that the local GPS source — SHM(0) — gets marked as falseticker and I'd like to ...
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296 views

Why is the /var/log/chrony folder empty?

we are using chrony in order to sync our servers to ntp servers ( redhat 7.2 ) we configured the logdir /var/log/chrony in chrony.conf and restart the chrony ( systemctl restart chronyd ) , but ...
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Configuring isc-dhcpd server for DHCPv6 with multiple NTP addresses

I'm trying to configure a DHCPv6 server to provide more than one NTP address (option 56) using the isc-dhcpd server. Is there a currently supported way of doing this? My first attempt was defining a ...
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NTP NIC binding

I'm wondering whether it's possible to setup NTP on a Windows Server running 2012 R2. The catch is that I only want one of the two NICs on the server to be used for NTP. Here's a little more ...
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97 views

Configure Windows NTP service for Linux clients

I have 100 Linux clients and a Windows Server 2016 in a closed network environment. I would like to have the Ubuntu clients time sync with the Windows Server's date-time. I have done this on internet-...
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377 views

What does x indicate beside NTP IP in the output of ntpq -p

Recently, I see an "x" appears beside NTP server IP in the "ntpq -p" output. Although my server seems to be connected to the peer NTP server, it's supposed to show an "*" instead of "x" prior to the ...
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Machines experience time offset despite chronyd service running

we have 3 machines in the cluster ( redhat 7.2 ) linux_machine1 linux_machine2 linux_machine3 the machines time are like this Sun Sep 1 13:54:20 UTC 2019 - linux_machine1 Sun Sep 1 13:34:15 UTC ...
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385 views

centos 7 NTP configuration

I am trying to configure ntp.conf with a stratum 1 server and also a peer VM on the same network. Config file is attached below. The problem is server with the IP address 10.6.11.171 does not seem to ...
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155 views

Kerio Control Time synchronization fails

I'm trying to put my Domain Controller as NTP Server in Kerio Control setting. but I keep getting the Error:"Time synchronization failed" in the Kerio Control log. I tried other online NTP servers ...
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querying data from NTP in ubuntu using socket

I have configured ntp to use gpsd as reference server on my machine. I am querying data from ntp directly, using udp socket. For ip address I use localhost and port_number = 123. Packet structure I ...
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Dell S-switches (S3124.S3048, S4048) and ntpq

We are using several Dell switches (S3124, S3048 and S4048, running OS9) in a network and want to use them as ntp-sources. That works fine, but none of these responds to NTP queries (ntpq -pn). What ...
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NTP chrony monitoring on Prometheus

We have configured Prometheus monitoring tool and now we would like to track and monitor the NTP/Chrony sync on all servers, Please let us know if anyone had written rules and alerts of this ...
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ntp + ntp loose synchronize each time in 5:00 morning

we have a very strange behavior we have 12 Linux redhat machines - redhat 7.x two of these VM servers are loosing the time synchronize each day at 5:00 in the morning after we restart the chronyd , ...

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