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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 2016 Server NTP error

I have a Windows 2016 Server, up to date. It is not a part of AD. The time it set up to synchronize with NTP server. The time on the server is wrong. When I update the NTP server and hit "Update ...
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Propagate local time over NTP to LAN

I have synchronized my L3 switch to an external time server, this is working correctly. However I'm in Europe and we have CET/CEST switching and I get UTC from the configured time server. I did setup ...
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NTP Debian: how do I know, if the last poll was successfull

I've got the task to write an application, that supports NTP communication. Everything works fine so far, but I need to know, if the last ntp poll was successful or not. When I pull out the network ...
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How to correctly sync time of an Hyper-V host which is member of a domain?

There are many posts concerning issues when dealing with time synchronisation over a domain which holds virtualised PDC Emulators (see this article). As a result our PDC Emulator time (and domain time)...
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NTP Traffic, but NTP not installed

I have recently started with OPNSense and have limited outgoing traffic to HTTP/s, SSH ports. When analyzing my blocked traffic i found sporadic outgoing NTP-Requests from my local Linux machine. I am ...
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Windows NTP client not syncing with Linux server

I'm trying to synchronize the time of three computer on a local network. Although having the smallest drift/error possible with the world/internet would be grate, it is not my concert. My main concern ...
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Windows NTP Server Registry Configuration

I inherited an environment with a Windows 2012R2 Domain Controller (serverA) set as the NTP server. This server is going to be retired shortly for a new (separate) 2019 instance. The domain controller ...
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firewalld: outgoing NTP connection will be logged as blocked, but isn't blocked

I have configure firewalld on CentOS7 so it blockes all outgoing connections. Only the needed connections are white listed by adding some rules. Also I have add rules to enable logging of blocked ...
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Cannot change NTP Time Source on a 2012 R2 DC Server

So I have seen dozens of people with this issue on various websites and forums, but here I am asking again. No matter what I try so far, nothing has fixed the issue which I will describe below in as ...
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Can't put correct date & time on LXC container with ubuntu

I'm tryig to put correct date and time, on Proxmox LXC container with ubuntu but I can't. There are some info of my server. ➜ ~ cat /etc/os-release NAME="Ubuntu" VERSION="20.04.1 LTS (...
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Chronyc equivalent for ntpdate -q

According to ntpdate and chronyd man pages In ntpdate -q : Query only - don't set the clock. chronyd -q : When run in this mode, chronyd will set the system clock once and exit. It will not detach ...
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Syncing Linux NTP to Windows 10 NTP

I have two computers. One is running Linux (NI Linux Real-Time), and the other is running Windows 10. The Windows 10 computer has two network interface cards. The 1st NIC is configured so that the ...
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Windows Active Directory - Change Time Server Settings after PDC/FSMO moved

We have configured a GPO to configure our PDC server like is described here (and many other blogs) https://docs.microsoft.com/en-us/archive/blogs/nepapfe/its-simple-time-configuration-in-active-...
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DHCP NTP Server Option 042 not propagated by Windows Server 2016

I am trying to make NTP server settings available to our non-Microsoft devices on local wired and wireless network. Obviously, they don't know how to use MS AD time info from domain controller. Our ...
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NTP Client not Syncing to Local Server

We have an ntp server run on a Windows machine which we want the debian device to sync from. I have tried numerous other suggestions in similar questions, none of which have had any results. This ...
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Do NTP pool servers use gpsd?

A bug in gpsd upon which some NTP servers rely, has been known for a couple of months, but it hasn't really become general knowledge until recently, just before the October 24, 2021 rollover that ...
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Using AD server as NTP server for non-windows hosts (rhel hosts). ntpstat continues to state unsynchronized but ntpdate works. Is this possible?

We currently have an AD server that we are using as a time source. Our AD server is setup to host time locally and the windows domain clients sync up to this machine fine. We have the firewall ...
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how to check whether the system time is synchronised to NTP server without knowing the ntp client used in the product?

how to check whether the system time is synchronized to NTP server without knowing the NTP client used in the product? I'm developing an application that is expected to run in both containers or ...
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Domain clients not seeing standalone DC as time source

I've got a Server 2019 DC (standalone/solo), running on physical hardware, which is configured and presenting as a reliable time source (TIMESRV and GTIMESRV flags are set), but all domain clients are ...
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Server dropped: no data NTP issue

When the time difference exists between the client and server, NTP can be synchronized normally. When they have no time difference, it displays server dropped:no data. transmit(192.168.30.22) receive(...
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Dell Compellent clock skew too great

I received this alert from our Dell Compellent SC200: " Alert created on controller '12345' for object [internal ref: 'Global '] - [ProgressionTime]: Some Data Progression features, such as RAID ...
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ntpdate -t does not timeout with the timeout value

I am using ntpdate to update the time. If there is no internet connection or the NTP server is down, ntpdate fails, but ntpdate takes a long time to exit (approximately 20 to 23 seconds). I read the ...
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ntpd does not sync clock if it gets internet connection little late

In our production box, I am a facing a problem with ntpd. I am enabling the NTP feature for our production box and observing one isssue. We start the ntpd daemon in the initialization process of our ...
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Troubleshooting NTP sync in VirtualBox Linux server

I have a rather simple setup where I have two computers: Computer A. has a normal NTP setup and uses the standard Internet sources (As per Ubuntu) to determine time. It also allows for query on IP 10....
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ntpd -g does not sync the clock

From ntpd man page If time is more than 1000s from the server time, ntpd assumes something must be terribly wrong and the only reliable action is for the operator to intervene and set the clock by ...
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Which server will ntpd daemon prefer for time synchronization if we have multiple servers in ntp.conf file

I read that ntp uses all the servers for time synchronization. It got me one question. Suppose I am having multiple servers in the ntp.conf file and time gap is also more than 1 day. I have not ...
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Valid format of key for each type in ntp.keys file

I have few questions on ntp.keys file and need your help. From man page, the format of ntp keys is `keyno type key` where type can be md5, sha1, ripemd160, sha224, sha256 etc. I have confusion on ...
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Centos ntpd can't sync [closed]

I have a Centos 5(I know that Centos5 is very very old) virtual machine that is refusing to sync. My virtual machine host is Windows 10 with HyperV and is syncing without problems. Things that I have ...
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Windows time service sync to external ntp servers only if they coincide

I recently had a problem which I've never seen occur before. One evening around 2030 one of the DC's changed its clock back an hour. This server syncs to two addresses in pool.ntp.org. Nobody was ...
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NTP Server is setup for ntp keys. How can we configure windows server to communicate to our time server using the keys?

We have an NTP server that was setup with NTP keys. https://docs.ntpsec.org/latest/ntp_keys.html We are trying to configure our domain controllers to use this NTP server as the authoritative time ...
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Is it possible to configure chrony to have different time sources with different priority?

Currently I have a number of Ubuntu 18.04 machines on a local network without internet access configured on chrony to refer to look up to one of them as the "master" as synchronize to it. ...
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Synchronize clocks with chrony without internet access

I have no experience in this field but I have the task to synchronize a number of Ubuntu 18.04 machines on a local network not connected to the internet. I tried using chrony following the ...
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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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3 votes
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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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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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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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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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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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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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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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4 votes
4 answers
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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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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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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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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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