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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CentOS 8 NTP: Chrony will not Sync with sources, timedatectl showing no sync but NTP active

I have been battling with Chrony for the last few hours and cannot seem to figure out what I'm doing wrong. I found that my system time was set to 2015 when trying to activate Epel-release in DNF, ...
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gpsd working but having issues with NTP getting time from SHM

raspberry pi zero with NTP module and external antenna. PI zero wired to gps module.. PPS and clock receive both connected (and obviously power and ground) Note: this HAS to work with no internet ...
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95 views

The “least bad” settings for Chrony as the NTP server on a virtual machine

I'm tasked with rebuilding a LAN server that's serving as the NTP server for hundreds of client machines. Unfortunately, it's on a virtual machine, and as demonstrated by questions like What are the ...
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libfaketime, the file /etc/faketimerc doesn't change the ouput of the date command

I am using the librarie "libfaketime" to fake the time of my system. My objective is to change the time inside a docker container, independently of the host time. It can allow me to ...
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42 views

Timesyncd not syncing with ntp server

I am using a embedded board which runs a DHCP client with systemd-networkd service. Here I have requirement to fetch ntp server with option 42 and synchronize time from it for every 32 seconds. I was ...
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38 views

How to speed up the local clock synchronisation?

I am running a ntp server, using the following configuration : server 127.127.1.0 minpoll 5 maxpoll 5 iburst burst fudge 127.127.1.0 stratum 0 refid GPS Is there a way for my server to select this ...
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47 views

Can a NTP Server escape the falseticker status?

I have 2 ntp server syncing to their local clock, the first one is a stratum 1 and the second is a stratum 7. The client is polling both of them and don't have a local clock as backup. My ntp results ...
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42 views

ntpd synchronization not working

I'm running latest Raspbian Lite on Raspberry Pi 3 B. Just reinstalled ntpd completely and it doesn't synchronize time with upstream NTP servers at all. ntpdate -u 0.debian.pool.ntp.org works just ...
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25 views

NTP Client ignore Server if the broadcasted date is too high

I read about the 2036 problem of NTP and i decided to make some tests on it. My server takes the time from his local clock, and my client takes the time only from this server (not even his local clock)...
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ntpd: permission denied writing to /var/log/ntpstats/ (statsdir directory)

I am running a NTP server on an Ubuntu 20.04 LTS. The server work fine and the client poll correctly the server. But i keep getting a permission error when i want to record statistics. I tried to ...
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31 views

NTP Server - +Hour

How can we implement NTP server with ability to distribute its time with +X hours or -X hours and without changing TZ on our operating systems. NTS has this ability but it's available for Windows. ...
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861 views

Sync ntp immediately at boot with undiciplined clock

I have setup one ntp server and 5 clients. I want to force sync the clients to server clock on boot. With my current ntp settings the computers are syncing but after several minutes. I cannot wait so ...
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Best practice for external NTP Server on Windows AD network

I have a Windows Hyper-V network. I have 2 domain controllers; both are VMs. DC1 runs on Host01 and DC2 runs on Host02. On each Domain Controller: w32tm /query /source returns VM IC Time ...
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Windows 2019 Server syncs time with ESX host rather than NTP server

We're building a new server stack. Our first Windows 2019 VM syncs to the ESX 7 host it's on rather than the NTP service on our router. The results of "w32tm /query /configuration" are below....
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What replaces “ntpq” in CentOS 8?

I want to install this utility ntpq as described here: https://www.cyberciti.biz/faq/linux-unix-bsd-is-ntp-client-working/ It prints all connected NTP servers and various NTP sync measurements. Cant ...
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2k views

ntpd fails to sync TIME_ERROR: 0x41: Clock Unsynchronized

On Debian 10, ntpd 4.2.8p12@1.3728-o fails to sync with following error: kernel reports TIME_ERROR: 0x41: Clock Unsynchronize here's ntp.conf: disable monitor statsdir /var/log/ntpstats restrict -4 ...
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NTP ManualPeerList Client Sync Issue, Windows Server 2019

I am facing NTP syncing issue on my Windows Server 2019 which is syncing as an NTP Client. The OPNSense firewall is syncing from : 2.ie.pool.ntp.org 0.europe.pool.ntp.org 3.europe.pool.ntp.org I have ...
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308 views

DC NTP not syncing and Local CMOS Clock issue

I've configured my DC (Domain Controller; Windows 2016) as described here to get his time from my Sophos-UTM. So i configured the GPO as described there. But after that and a restart of the server i ...
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294 views

NTP synchronizing always in local

I have an Ubuntu 16.04 with the following NTP configuration: driftfile /var/lib/ntp/drift restrict -4 default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery ...
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112 views

Windows Server VMs have incorrect time on boot (Esxi 6.7.0 Update 3)

We run ESXI 6.7.0 Update 3 (Build 14320388). The Windows 2019 VMs running on that host, when they boot, their time is incorrect. I have to manually open the Windows settings and set off and back on ...
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Do NTP servers log ip addresses [closed]

There are many NTP servers like time.google.com time.cloudfare.com and so on . Do these services log ip addresses of the visitors?Have heard that http servers do log ip addresses and though not ...
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57 views

How to change time on local NTP server and distribute to others? [closed]

Is there any solution to retrieve time from a NTP server and change time locally (Increase or decrease) and then distribute new time to other servers? As an example, server retrieve UTC time and ...
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72 views

NTP sync over 500 devices

Daylight Saving Time is coming soon so I would like to face with problem with NTP. I've got around 500 devices which should be synchronized through NTP. DST is good oportunity to perform it becouse of ...
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115 views

Chrony stepping instead of slewing clock

I have a bunch of RHEL 6.8 - 7.4 Azure VMs for which the system clocks are out of sync (up to 300s slow). I'm installing Chrony on them but rather than slewing the clock to the correct time it is ...
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921 views

NTP enabled is no but sync is yes on RHEL7

How can it be synchronized but not enabled? Redhat 7.4 Date and time are right. ntpq -p shows it's connected to a remote ntp server. Systemctl status ntp shows its enabled. Nothing in /var/log/...
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673 views

Unable to get NTP server to sync

TLDR: I am getting "Leap 11", which means the server is unsynchronized. How to I fix this? Some background for the problem I am trying to solve. I have a payload that will be on a spacecraft....
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81 views

Receiving a lot of NTP requests

On my server I see a lot of NTP requests. All NTP traffic is blocked by iptables. Is there anything more I could do to stop this traffic? 28M 1019M DROP udp -- * * 0.0.0.0/0 ...
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200 views

How to get clock accuracy for systemd-timesyncd

I am trying to identify how accurately my clock has been synced using systemd-timesyncd. I ran the following command however there is a lot of information and it isn't abundantly clear what one is the ...
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NTP peer does not syncronize

i set one ntp server . but ,peer does not synchronize time from server. i set accurate time on my client site .but when i want to synchronize time from server by typing this command "ntpdate -u ...
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11k views

Ubuntu 20.04 time sync problems and possibly incorrect status information

I have been having some problems with crashes on my KVM host (Lubuntu 20.04), and when troubleshooting, I noticed some time-related errors. Upon further investigation, to my horror, I saw that time ...
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933 views

ntp client not working on Raspberry Pi

Disclaimer : I am not that good with Linux, i'm mainly a Windows admin. So i have a bunch of Raspberry being deployed on my network, and one of the issues i'm facing is they can't keep the right time ...
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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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2k views

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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163 views

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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321 views

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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107 views

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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141 views

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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938 views

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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462 views

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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1k views

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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4k views

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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358 views

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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188 views

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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253 views

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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40 views

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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3k views

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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43 views

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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740 views

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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