Questions tagged [time-synchronization]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
35 views

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)...
user avatar
  • 253
0 votes
0 answers
100 views

timedatectl: Failed to query server: Connection timed out

I have a VPS server (centos 7) with WHM/cPanel as well as root SSH access. Now I want to change the time zone of the server, but when I run the command timedatectl following message shows after some ...
user avatar
0 votes
1 answer
20 views

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'...
user avatar
  • 703
0 votes
0 answers
40 views

How to set time source on Hyper-V guest to VMIC

I'd like to set the time source on my Hyper-V hosted Windows Server 2022 member server to VM IC Time Synchronization Provider. Currently it's at Local CMOS Clock. It was set to PDC.DOMAIN.local, but I ...
user avatar
  • 703
1 vote
2 answers
71 views

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 ...
user avatar
  • 353
0 votes
0 answers
10 views

Unknown geolocation system settings OTP error

If you use a vpn or tunnel browser traffic through additional hops to destination. Web apps that use time sync for security or other features may fail. The solution is changing OS system time to ...
user avatar
  • 1
1 vote
1 answer
109 views

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 ...
user avatar
0 votes
1 answer
276 views

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 ...
user avatar
  • 179
0 votes
2 answers
2k views

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 ...
user avatar
0 votes
2 answers
241 views

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 ...
user avatar
1 vote
2 answers
153 views

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 ...
user avatar
  • 1,319
4 votes
4 answers
2k 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 ...
user avatar
  • 43
1 vote
1 answer
2k views

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 ...
user avatar
  • 99
0 votes
1 answer
453 views

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 ...
user avatar
  • 217
1 vote
1 answer
2k views

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:...
user avatar
-1 votes
1 answer
297 views

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 ...
user avatar
  • 19
0 votes
1 answer
1k 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 ...
user avatar
  • 113
0 votes
2 answers
475 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 ...
user avatar
0 votes
1 answer
626 views

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 ...
user avatar
1 vote
0 answers
391 views

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 ...
user avatar
-1 votes
1 answer
166 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 ...
user avatar
2 votes
2 answers
3k views

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 ...
user avatar
5 votes
1 answer
27k 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 ...
user avatar
0 votes
1 answer
3k views

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 ...
user avatar
2 votes
1 answer
568 views

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 ...
user avatar
2 votes
1 answer
488 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 ...
user avatar
1 vote
1 answer
6k 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 ...
user avatar
  • 21
0 votes
1 answer
33 views

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?
user avatar
  • 25
1 vote
1 answer
156 views

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 ...
user avatar
  • 25
0 votes
0 answers
20 views

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 ...
user avatar
  • 21
2 votes
0 answers
222 views

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:...
user avatar
  • 131
1 vote
0 answers
71 views

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 ==========...
user avatar
  • 131
0 votes
1 answer
461 views

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-...
user avatar
1 vote
0 answers
130 views

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 ...
user avatar
-1 votes
1 answer
828 views

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 ...
user avatar
0 votes
2 answers
11k views

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 ...
user avatar
  • 121
1 vote
1 answer
2k views

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 ...
user avatar
  • 141
0 votes
2 answers
2k views

CentOS 7 - how does timedatectl sync time and date without NTP?

I am creating automated tests for an rsync-like utility and I need to be able to set the clock back 24 hours for one of the tests. However, when I use timedatectl to set the time and date they ...
user avatar
0 votes
2 answers
241 views

What sources does public NTP servers use to ensure time sync?

As from the title, I would like to know what sources “pool.ntp.org” and other big NTP service providers use in order to ensure they are in sync and serving clients the exact date and time.
user avatar
  • 1,679
0 votes
1 answer
32 views

Query Network Client Date

Question: Is there a way to ping or query the date of a client linux computer for the purpose of verifying time synchronization? Setup: I have two computers on a network. One linux machine (machine A)...
user avatar
0 votes
1 answer
2k views

How do I force a domain controller to sync with the PDC?

DC2 (a VM) is not syncing to DC1 (a physical server). On DC2 I get: PS C:\> w32tm /query /source Local CMOS Clock What must I do so that DC2 syncs to DC1 as its time source? Background: I had ...
user avatar
  • 963
2 votes
2 answers
884 views

Decentralized NTP in network with only sporadic internet connectivity?

I have a (most of the time) isolated network consisting of several computers. computer 0 -- external NTP server / switch -- computer 1 -- external NTP server \ ...
user avatar
  • 121
3 votes
1 answer
169 views

Compute Engine VM clock runs fast and gains 15 seconds per hour (or about 1 second per each 4 minutes)

I have a 2 vm instances in GCE that do not keep correct time in spite of the server OS being set to sync with NTP every 24 hours. The OS clock gains about 1 second of time every four minutes (or ...
user avatar
  • 31
0 votes
1 answer
367 views

2008r2 clock running fast

I have 27 2008R2 servers (all Hyper-V guests) that recently started running fast. There are other 2008R2 servers on the same hosts that run spot on. The time averages from 2 to 3 minutes fast but at ...
user avatar
  • 1
0 votes
3 answers
468 views

Properly setting date on Linux machines

I am trying to set the system date on my linux machine. If it matters, it is an Amazon EC2 machine that I provisioned. I tried to set the date with this command: sudo date -s "19 APR 2018 11:14:00"; ...
user avatar
8 votes
3 answers
5k views

Ntpd on local network - Preventing clock drift causing high offsets

I have a local network with a microcontroller ARM as the NTP server and I have a desktop computer running with ubuntu 16.04 LTS as a NTP client. Once I start ntpd -g -c /etc/ntp.conf with the ...
user avatar
  • 211
1 vote
1 answer
10k views

EventID 1 - An application or system component changed the time

Our VM's are coming up with the following errors in the Event Log - EventID 1 Change Reason: An application or system component changed the time. All the DC's look to be time synced correctly, but ...
user avatar
4 votes
0 answers
2k views

Why did w32tm /resync cause it to correct itself, then overshoot?

Background: My LAN's Windows Server 2012 R2 Domain Controller had been running without any external time server for a few years and I finally synchronized it now. It had been running about 2 minutes ...
user avatar
  • 2,251
12 votes
3 answers
3k views

How to synchronize time on ESXi Windows virtual machines within one second?

I'm a developer and we are using Quartz.Net, widely used scheduling library with SQL backing store to run cluster of jobs servers (VMs on ESXI cluster). Quartz.Net requires that time will be ...
user avatar
  • 223
8 votes
2 answers
1k views

linux system time temporally jumps

I saw a strange system time changing behavior in some (hardware) servers: in /var/logs/syslog, the date time preceding each log message sometimes change to a random one and gets back to normal in the ...
user avatar

1
2 3 4 5