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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How it is possible to run two separate chrony instances (on a same pc): one client and one server

All ntp servers and clients are implemented using chrony on RHEL 8.2. NTP client [200.100.1.3] has no access to [NTP server 200.100.1.1]. NTP client [200.100.1.2] has to get time information from NTP ...
Vinod's user avatar
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How to synchronize time between two devices on a local network using NTPD, with one device serving as both client and server on separate interfaces?

I am using STM32MP1 based two devices which runs on Yocto Linux platform. Among them one has two network interfaces (wlan0, wlan1) where wlan0 is used for connecting with internet servers & wlan1 ...
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NTP symmetric key authentication to chrony servers

Pretty simple question (I think), but in reading chrony's own docs and perusing through RedHat's docs, I can't find a firm answer. Probably because it's too dumb of a question to need an answer :P If ...
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2 votes
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623 views

Time difference between NTP servers

I have a unique offline LAN. It contains two servers that get time from the same source. They do not reach out to the internet for their time source. They receive time from an application layer. I ...
RyBoneCoder's user avatar
1 vote
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How do I use Group Policy to sync client time in an Active Directory domain with an external NTP server and not the domain controller?

I have an Active Directory domain, with a domain controller running on Samba on Linux. I noticed that my Windows clients are having clock drift. I think this is because they really want the domain ...
interfect's user avatar
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Reducing NTP offset with local server and Windows 10

I'm trying to synchronize my Windows 10 (22H2) workstation with our local NTP server. I already synced another Linux device and I got <1ms offset: nvidia@nvidia-orin-rt:~$ ntpdate -q 10.1.2.3 ...
Gorgo's user avatar
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Change w32tm source to external server

We have an on-premises NTP server named NTPserver and adjust the w32tm source to time.windows.com. There is a domain controller server that the w32tm source is Local CMOS clock. I want to change the ...
Udemy Instructor's user avatar
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Intentional Time Skew for NTP on Windows Server (2016)

Due to a badly written interface, I have a need to ensure that server A is always a few seconds ahead of server B. (Yes I know this is a horrible thing to do) I have three broad solutions so far: (...
Mathew Frank's user avatar
4 votes
2 answers
4k views

Windows Server 2022 Time Service Jumping into the future

A handful of times over the last few months one of our Windows Server 2022 boxes will show a warning in the Event Log similar to this The time service has set the time with offset 19630688 seconds., ...
chris1out's user avatar
6 votes
1 answer
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Does installing NTP mean I'm installing an NTP server?

Reading this: What are the limits of running NTP servers in virtual machines? (2010) And this: https://github.com/geerlingguy/ansible-role-ntp I'm not sure what exactly I'm installing. Especially if I'...
KoenDG's user avatar
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Defaulf gateway as NTP server [closed]

I need to redefine the NTP server for every device in my company network and I have two options: Configure each device for using the default company NTP server Configure each device for using their ...
Ana Maria's user avatar
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3 answers
223 views

Can I use one FQDN for all DCs for server authentication and one FQDN for NTP synchronisation?

I'm struggling in regards of a proper practice for server setup for LDAP/AD authentication and NTP. I was thinking if asking two separate questions will be better but I think being a common problem ...
Radosław Serba's user avatar
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418 views

Linux bridge does not propagate multicast ntp messages

My hardware, based on imx8, has two ethernet interfaces. These are connected together as a bridge, all messages not for this he are forwarded. Everything works as expected except multicast messages: ...
H.Arslan's user avatar
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ntp is not using servers from /etc/ntp.conf

on GCP VM I'm trygin to define custom ntp servers but seems like ntp service is not reading /etc/ntp.conf file. I added 4 servers from ntppool.org ntpq -pn constantly return the same result (metadata....
RedBluff's user avatar
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GCP Debian VM ntp stuck in INIT

I am trying to get NTP working for a Debian 10 VM client machine in GCP. These are the relevant config lines in /etc/ntp.conf: server metadata.google.internal iburst server 169.254.169.254 iburst # ...
Robert Campbell's user avatar
1 vote
1 answer
584 views

Domain Time Skew

A few months ago I attempted to get time straightened out in our environment but I never really got it working correctly. We have 4 domain controllers and the time difference always seems to be ...
Rebound4750's user avatar
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Ubuntu 20.04 refuses to sync time with Windows AD, how to trouble shoot?

I am trying to sync a Ubuntu 20.04 client to a Windows AD time server. But time will never sync. Here is what I know so far: Windows server is listening on port 123 for NTP, and replies to requests. ...
Dave's user avatar
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On what port does google ntp offer daytime services?

I want to do time request on an socket client. According to this time.nist.gov is on port 13 Does time.google.com have a similar service so that I can connect a socket client to it. just like I can ...
Bret Joseph's user avatar
1 vote
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353 views

NTP client synchronizes with LOCAL instead of stratum 1

I have 2 NTP servers. One synchronized directly with a GPS clock (I will call this server 185), so st 0. Then I have a second one (Let's call it 186) that should synchronize with the 185 since it is ...
Moncloa's user avatar
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Windows event log shows events in the future

One of my Windows server VMs seems to be time travelling without my permission: Screenshot of Windows Event Viewer The text reads: time service was not able to sync the system time since 1601267 ...
md7's user avatar
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How to test whether NTP server is secured or not

We are trying few of the configurations of NTP in ntp.conf file and want to be sure whether the NTP server is secured or not. Following the recommendation provided here: https://support.ntp.org/...
Anon's user avatar
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NTP Server Precedence using systemd-timesyncd

I'm looking for documentation which specifies the precedence / priority of NTP servers (ubuntu 20.04). I am using timesyncd which has the ntp.ubuntu server But when connecting to the network via DHCP ...
Jake Baker's user avatar
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How can the local time clock of a server become the NTP time source in a network?

I want to make a the local te clock in a Stratum 1 server be the network time source for my network (I don't want a Stratum 0 server with the antenna). How may I set this up in a network? Is there a ...
Baldovín Cadena Mejía's user avatar
3 votes
3 answers
13k views

how to verify the setting of linux ntp client?

I'm currently managing some RHEL 7.9 hosts which need to sync time to NTP server and only the ntpd can be utilized for time sync. I did the following configurations in OS but not sure whether the ...
user53815's user avatar
-1 votes
2 answers
224 views

How to determine if NTP has updated the time

I am on a Raspberry Pi and have a service that wants to know how inaccurate (ie - number of seconds) the system time is if the system time is off by at least one minute. When Raspberry Pi starts up, ...
icu222much's user avatar
2 votes
1 answer
636 views

What is changing my Windows Server's date?

At my organisation we have a number of virtual machines on ESXi hosts in a number of sites. For the past few months, around once or twice a week one virtual machine, seemingly at random, will update ...
Mayzed's user avatar
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systemd-timedated.service: Failed to determine whether NTP is enabled: Link has been severed

Encountering this issue with RHEL 7.9 (Maipo). One server in particular is having issues with timedatectl, systemd-timedated.service, and chrony. If we run timedatectl $ timedatectl Failed to query ...
bpaterni's user avatar
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What's the default NTP server used by systemd-timesyncd?

In my Linux distribution is enabled the service systemd-timesyncd. Very useful to understand how the service works is this post answer. Below I report some system information about this service: its ...
User051209's user avatar
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606 views

Custom time zone for Wifi connected devices?

I have Wifi router and server that a number of devices connect to on a ship. The devices are both mobile(iOS, Android) and laptops. Connections are so that the devices can only access a specific ...
Karlth's user avatar
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ntp server reject my VMs but the network looks good

Recently there are always several SLES12.5 VMs in my domain got the NTP sync issue. So I made some research on it. Here's the details-- I found 1 VM often raise NTP issues. So I started a monitoring ...
EisenWang's user avatar
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1 answer
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Trigger NTP restart after `vagrant resume`

I manage some Debian 11 server VMs using Vagrant. Sometimes I need to vagrant suspend them, and I noticed that after vagrant resume, their system time is off. Running systemctl status ntp shows the ...
kol's user avatar
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1 answer
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NTP traffic causes frequent ARP requests

I am running Ubuntu LTS 22.04 using Chrony as NTP server. I discovered that even with frequent NTP traffic between a NTP client and the NTP Server, the ARP requests are still being sent back and forth ...
RXS's user avatar
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3 answers
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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 ...
B3ne's user avatar
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1 vote
2 answers
169 views

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 ...
Markus's user avatar
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1 answer
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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)...
Riccardo's user avatar
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2 votes
1 answer
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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 ...
BillGatesPriv's user avatar
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2 answers
2k views

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 ...
apalomer's user avatar
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1 vote
1 answer
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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 ...
jrd1989's user avatar
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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 ...
Steffen's user avatar
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1 answer
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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 ...
ksrobinson's user avatar
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1 answer
3k views

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 (...
xabikip's user avatar
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3 votes
1 answer
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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 ...
Dexpras's user avatar
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1 answer
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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 ...
bmb's user avatar
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2 answers
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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-...
Uh Trog's user avatar
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1 answer
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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 ...
mt42's user avatar
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1 vote
1 answer
976 views

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 ...
vbscript's user avatar
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1 answer
266 views

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 ...
Spencer's user avatar
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1 answer
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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 ...
IT_User's user avatar
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2 votes
3 answers
3k views

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 ...
Baranikumar Venkatesan's user avatar
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121 views

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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