Questions tagged [time-synchronization]
The time-synchronization tag has no usage guidance.
258
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NTP / Chrony time sync with no external source
we have a customer who doesn't allow internet access, so all servers are in their own clock mode.
we used windows Domain controller to be the Source but as it cant talk to internet, STRATUM is low so ...
2
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1
answer
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W32Time doesn't respect MaxPosPhaseCorrection settings
I'm having a problem with W32Time service on Windows Server 2019 not respecting the default limit on positive time offsets (MaxPosPhaseCorrection/MaxNegPhaseCorrection = 15 days). The server is ...
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1
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Docker - linux container run on Windows has different time
I work on Windows 10. I use a docker image based on Ubuntu 18.04 (FROM ubuntu:18.04). When I run a Linux container using Docker the time returned by "date" command differs from the time on ...
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1
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Windows Server Time-Service jumps into the future and (partially) back
This looks like the same issue as Windows Server 2022 Time Service Jumping into the future.
I've also added a support ticket at Microsoft (Feedback Hub) for the issue: https://aka.ms/AAkwnpl
As the ...
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0
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1
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Both LOCAL SERVICE and SYSTEM users are changing server time on DC
Odd one for you, our DC's time keeps changing by an hour, but it doesn't just go down by an hour it also go up. I've been monitoring the event logs and I can see that there are usually two entries ...
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150
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Windows Server 2012 R2 with hour/time issues
In my office, we have a Windows Server 2012 R2 with our SQL Server on it.
We are located in a UTC-7 timezone where we "suffered" DST (but not anymore).
Multiple times a day, our server clock ...
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1
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0
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191
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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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267
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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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1
answer
630
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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 ...
2
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3
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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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154
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TOTP OTP timesync linux RTC
TOTP ((T)ime-based (O)ne-(T)ime (P)assword. is not working for any site that requires it, tried all major browsers, chrome, chormium, firefox. How to fix ?
Completed Troubleshooting:
$ timedatectl ...
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1
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413
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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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2
answers
414
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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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583
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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) : ...
- 2,143
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2
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Windows Server Time not syncing correctly (at all?)
I have a domain controller running Server 2019. I have two other DCs in the domain. On the server that is running the PDC Emulator roll, I configured it to point to the Navy's time servers.
w32tm /...
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Chrony Configuration to Accept Radio Time Signals
Is there a way to have Chrony accept an externally generated clock pulse ?
For example, I want to use the Canadian radio time source CHU to provide ticks on the second. Assume that I have the required ...
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1
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533
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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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1
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27
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PDCe time won't sync
I'm encountering a very strange situation where the time on my VM-hosted PDCe is reported as synced, but the actual time doesn't sync. The server's running about an hour fast.
Here's what I've got:
I'...
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2
answers
1k
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chrony: hosting time with RTC as authoritative clock on an air-gapped (isolated) system
I have an isolated and air-gapped LAN that I want to synchronise. I have one host that will be the authoritative time server for all clients on the LAN. It's not important that the LAN time reflects ...
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1
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559
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Incorrect PTP timestamps [closed]
I have trouble syncing to Linux systems using PTP.
Setup:
Two PCBs with a BegleCore module and a DP83640 PHY are connected with each other over Ethernet. One board should act as the PTP master, the ...
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1
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1k
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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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2
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10k
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NTP/Chrony not keeping time synchronized on CentOS 7.9 (VM running on VMware ESXi)
I have 3 servers running CentOS 7.9.2009 in a data center (VMware ESXi). These servers report that the time is not synchronized. I have a similar test environment running on an inhouse VMware ESXi ...
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2
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827
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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 ...
1
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2
answers
380
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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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4
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5k
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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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1
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4k
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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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1
answer
3k
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Windows Client Time Sync with Domain Controller(s) not working properly
I can confirm my domain controller (primary and backup) are syncing with a time server correctly. They're within +0.0002 or so seconds last I checked.
I can confirm this with w32tm /monitor from the ...
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How to Set Up Time Synchronization with NTP on Ubuntu 20.04.1 LTS
After updating the base system with the latest available packages:
apt-get update -y
and
root@localhost:~# timedatectl
Local time: Wed 2021-01-06 08:03:11 UTC
Universal time:...
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1
answer
869
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chrony time synchronization problems
We have a cluster where exact time synchronization is very important. We use Ubuntu 20.04 servers and and chrony. Unfortunately there are always problems with time synchronization. No other known time ...
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1
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2k
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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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2
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1k
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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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1
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1k
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Programmatically detect Chrony time sync events
I am working on a sensor system, which runs on an embedded Linux platform and doesn't have access to the internet. An external GPS time server device is connected to provide time synchronization using ...
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0
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662
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PPS Integration with chrony
I am trying to get chrony to ingest a PPS signal to compare against just an NTP server. The PPS signal is recognized when I do ppswatch and ppstest, but when I do chronyc sources, the LastRX field ...
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402
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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 ...
2
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2
answers
6k
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Azure AD Joined Windows 10 Workstations | Time Sync?
I'm looking in to understanding how Time Sync works with a Win 10 Azure AD Joined laptop/workstation. Looking at my laptop, I noticed that Windows Time is not started and set to manual. Starting it ...
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1
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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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1
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5k
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date and time in pods in kubernetes hosted in own datacenter
I am having issue with date and time in kubernetes cluster. My host time is sync using the ntp. Though i have synced it after configuring the cluster. Now all the pods created within my cluster will ...
2
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1
answer
1k
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What time zone does windows event logs show
I have a doubt on the time zone shown in the windows event logs. I had read that if I export the windows event logs from another machine and open it in my machine which has a different time zone, the ...
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1
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944
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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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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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1
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36
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How to synchronize the timing of two or more distributed wireless nodes?
What is the best approach(s)/ method(s) to synchronize the timing (clocks) of two or more distributed wireless nodes such that these are coherent with each other and not slipping cycles?
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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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0
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22
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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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0
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351
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What is the packet count in timedatectl timesync-status command
I am trying to understand the output from the timedatectl timesync-status with an example shown below:
Server: 91.149.91.123 (ntp.ubuntu.com) Poll interval: 32s (min: 32s; max 34min 8s)
Leap:...
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0
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137
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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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1
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662
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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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188
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Hyper-V DC VM time keeps reverting after resync
I have a domain controller running Windows Server 2016 in Hyper-V on a Windows Server 2016 Host. My time is off by 9 minutes. I've configured the following command to force custom NTP servers to be ...
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understanding windows time configuration
I wish to set external time source for all Vms and HyperVs in several domains. Most of the systems are windows Server 2012 R2 or Server 2016. I have been reading a lot of explanations and I somehow ...
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2
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Domain-joined computer won't switch time source to domain from "Local CMOS Clock"
My situation is almost identical to the one cited in this post:
How to change time source from "Local CMOS Clock" to "DC"
I have a domain-joined computer that is showing "Local ...
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There's no ntpd in centos 7, how to sync time automatically and manually with chrony?
Seems there's no ntpd in centos7, how can I sync time in centos7?
I found out that chrony should be used in centos7, what is manual way to update time using chrony?
I assume chronyd is something ...
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