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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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Find windows process that is changing time back 1 hour

I have a windows machine which will periodically change the system time, for reasons unknown. It appears to happen every hour. This windows machine is a virtual machine (Parallels Desktop 9, Win7 guest, OSX host). It has an NTP service (NetTime)…
Ian
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Do "service ntpd restart" and "ntpdate " do the same work?

I often get large offsets when checking ntpd using ntpq -p, I generally restart the ntp daemon and it fixes the issue. I wanted to know if i can try the ntpdate instead of restarting ntpd. Since this is a production box wanted to…
Shiva J
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Is my NTP configuration working (with a multicast peer)?

Introduction I'm trying to do some work in which I must receive an NTP update from peers but I'm concerned that there isn't any being received. Here's the output of ntpq -np: remote refid st t when poll reach delay offset…
karobar
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CentOS 7 - ntp stuck .INIT

I've two ntp servers with one client server. NTP servers are sync time OK. The client stuck on .INIT. step but sync manually works. The client ping and have allowed policies with NTP servers. Alls machines are in CentOS 7 version. Firewallinng : #…
user451320
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Why is my 1PPS GPS stratum-1 clock always ~100ms behind other ntp servers?

I am trying to set up a stratum-1 time server. I have a Navisys GR-701 GPS which is capable sending a 1 PPS signal. According to the spec sheet and sources such as this, I am under the impression I should obtain ~1ms accuracy with ntpd. However, my…
Jeff Mixon
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ntpd synchronizes but chronyd fails

I am setting up a time server with chronyd but it fails to sync. # chronyc sources 210 Number of sources = 5 MS Name/IP address Stratum Poll Reach LastRx Last…
Joe
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Immediately fix system clock after VMware stun

It's a known issue with VMware that it performs what is called a "stun" during certain operations, such as vmotion, and snapshot create/delete. During this stun, the guest OS is frozen, and so when it comes back, the system clock is behind. Now the…
phemmer
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How can I confirm that the server will add a leap second on 1 Jan 2017?

How can I confirm that the server will add a leap second on 1 Jan 2017? Is there is log on ntpd?
Harold Chan
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ntpq -p not printing expected results

I'm having troubles to set up ntp client functionality, on debian system. when typing ntpq -p the output is always the same (all zeros and no stats in the output) which looks like this: sudo ntpq -p4 remote refid st t when poll…
gmlox
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Testing Daylight Savings Time Switch

We have a case where we need to test some scripting and application code related to daylight savings time. We wanted to simulate the daylight savings time switch by disabling the NTP service and changing the system time into the future. Obviously…
Jeff Coe
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NTP high-availability behind a Virtual IP

Is it a bad practice to put a NTP server behind a Virtual IP? (VRRP) How much would it be preferred to simply have the clients talk directly to the 2 instances? Since the NTP clients keeps the server's refid, I suppose it would distinguish when the…
Phil
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NTP not syncing automatically with my internal NTP server

I installed ntp on a centos server. I modified /etc/ntp.conf replacing the default server entries with one entry to my internal NTP server's IP (1.2.3.4 is the IP of the NTP server): server 1.2.3.4 iburst When I reboot the server and run ntpstat…
red888
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Does a Windows 2012 NTP server need an upstream NTP time source

I have a set of 3 Windows 2012 Server VMs running as my domain controllers. These VMs are in an air-gap environment, meaning no access to upstream NTP servers. I haven't been able to configure my ESXi hosts (running version 6) to act as NTP clients…
shifflettd
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Windows server time keeps setting the time 2 hours back

Our Windows 2012 server keeps setting its system clock 2 hours back. I've tried to run 'w32tm /resync' a couple of times but that does only works on short term. the server manager gives an Error with ID 36 and the following description: The time…
MickBoe1
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Securing my NTP configuration

Need some assistance configuring my ntp.conf file for my primary NTP server. Does my configuration accomplish the following: Prevent the servers being polled from changing my configuration? Allow my peer to sync up? Allow clients to get time from…
hilburies55
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