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 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.,
...
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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'...
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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 ...
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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 ...
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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: ...
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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....
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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
# ...
google-cloud-platform
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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 ...
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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.
...
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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
time.google.com is on what port?
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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 ...
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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 ...
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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/...
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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 ...
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How to delete chrony server from client side without restart service
I am trying to setup chrony client server on local and try to add chrony server and delete on the fly
I am able to add without needing to restart chrony using this command 'chronyc add server iburst ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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Chrony seems to be synchronized, but kernel keeps unsynchronized flag for the system clock
I have a chrony service (version 3.4-4+deb10u2 - Debian 10) that seems to be running correctly:
chronyc tracking
Reference ID : A29FC801 (time.cloudflare.com)
Stratum : 4
Ref time (UTC) : ...
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Juniper SRX NTP Process
I have a SRX340 running 22.2R1.9 with a NTP problem where it seems like the xntpd process is dead.
When I change the configuration to add a new NTP server, the new NTP server does not show up in show ...
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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 ...
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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 ...
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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 ...
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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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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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