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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Ceph: HEALTH_WARN clock skew detected

I have configured ntp on Ceph nodes and time is synchronized! But ceph status always shows clock skew. ceph health detail shows: mon.node2 aadr 192.168.56.102:6789/0 clock skew 7192.45s > max ...
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configure windows 7 as an ntp server

I have configured windows 7 as NTP server in a Lab, that I manage with no access to the internet. It can sync time with it self but I can't sync the other computers with it. After running from the ...
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26 views

Centos 7: ntpstat unsynchronised

I'm setting up a server with a service that is very sensitive to date/time. So I'm trying to configure ntpd but it doesn't seems to work. I'm using the default Centos 7 configuration with the ...
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25 views

MS WS2012 R2 - Integrated NTP client / server

Can WS2012 R2 be configured as a stratum-1 NTP clock source (client to NIST time servers) to which other internal hosts are synchronizing against ... hence NTP client and server functionality ? From ...
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60 views

NTP set up on private AWS subnet within VPC: NTP public server DNS works but not ip, why?

I have a NAT server that's in my VPC's public subnet on AWS. It's pretty happy with its NTP setup so I thought, no problem, let's get all my private subnets using this server as their designated time ...
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117 views

Wrong hardware time on linux

I don't have the correct hardware time on my debian server: root@server[09:48]:date Tue Dec 22 09:48:52 EST 2015 root@server[09:48]:date -u Tue Dec 22 14:48:54 UTC 2015 root@server[09:48]:cat ...
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34 views

NTP server time drifting

We currently do not have NTP (Network Time Protocol) appliance in our environment. So we are using one of server as NTP master server and remaining servers are synced with this using NTP port. Is ...
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49 views

NTP: Linux client won't sync with Win7 server running ntpd ( not w32time)

We have a 'bot with a Linux host running on an internal network connected only to a Win7 host. The Win7 host has internet access, but the Linux host does not. (historical reasons) When I load NTPD ...
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25 views

NTP with Authentication on Windows System

Can we configure NTP Server with Authentication on Windows System i.e Window Server 2008 R2 Standard or Windows 7 Operating System. I need to sync time securely for my Cisco Switch and Router and for ...
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47 views

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 ...
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27 views

Different offset in “ntpq -p” and “ntpdate -q”

I'm sometimes notified by our system monitoring about too high offsets in ntpd. When issuing ntpdate, it shows none. As ntpd adjusts time slowly, it seems to "think" there is an offset which needs to ...
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24 views

Windows Domain Network, Cisco 1921 ISR, and NTP

In an effort to make sure all Windows application that rely on time work (such as RDP), and to make sure logging between computers and router are using the same times, I would like to use NTP ...
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21 views

Time servers does not always respond [closed]

I have embedded devices without any OS and I wanted to implement NTP to synchronize time. I have written some C program to test NTP on Linux (I send ntp datagrams to time server with different time ...
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282 views

NTP: How to establish redundant solution for NTP servers?

In my company's infrastructure there are 5 data centers in remote locations. In each remote location, there's a pair of servers which hold DNS and NTP services and are configured on each one of the ...
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49 views

Domain server sync NTP is now 4 mins faster

We activated the sync time with external NTP (0.north-america.pool.ntp.org, 1.north-america.pool.ntp.org) on the DC for quite a while, and lately the synchronized time is now abt 4 mins faster than ...
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67 views

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 ...
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30 views

Yosemite 10.10.5 Clock drifts while asleep

We have a cart of Macbook Pros with Yosemite 10.10.5 installed on them. Our school network uses 802.1x for authentication to the WiFi, but when these laptops are put in their carts and left to sit ...
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72 views

Is it possible for NTP to have two system peers at the same time?

In some rare cases, ntpq -p reports here that it has two system peers, like this (IPs and results anonymized): remote refid st t when poll reach delay offset disp ...
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71 views

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 ...
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312 views

How to fix time on NTP server with a lot of machines synchronized by it

I have one NTP server which has a wrong time setting which are 7 hours in the future (timezone was changed after machine shipment, but not the time). The server itself is not synchronized, but only ...
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80 views

AWS - ELB - NTP - Unable to forward UDP Traffic?

I am trying to setup two micro-instances behind an internal ELB which will handle mundane tasks such as central logging and NTP queries, but come to realize that ELB doesn't support UDP forwarding. ...
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52 views

Configuring Windows Times Service for non-PDC emulator

Not to get to deep into the weeds, here's the gist. A SysAdmin of ours created GPOs on the Domain Controllers Policy (DCP) and we've been having time issues ever since. Neither he nor I know if the ...
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84 views

Is it possible to increase the rate at which ntpd updates the system clock?

We have some hosts that have gotten out of sync due to ntpd being mis-configured, with an ntp server that was unreachable. Our clocks on some hosts (CentOS 6) are now upwards of 30 seconds off (in the ...
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36 views

How do I query a Domain Controlers NTP service from a linux box?

I need to confirm that a Domain Controller is acting as a NTP time server for non windows devices and servers. I figure there must be a command in linux that will query an NTP server and see if it is ...
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29 views

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 ...
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53 views

ntpdate on ec2: no server suitable for sychronization

I'm trying to turn NTP on for a handful of EC2 instances inside a VPC, starting with ntpdate, since my server is pretty far off and I don't want it to slew. I'm running into the 'no server suitable ...
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263 views

Windows 2012 R2 NTP server Unable to sync with Cisco Nexus

I am the PDC Admin, The Windows NTP server is set correctly, we have 5 different time sources set. We are able to sync with 2 of those time sources and other external time sources such as ntp.org ...
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65 views

How accurate can we get computer clocks synchronized in a local network of any number of computers?

In the past, I have seen that most of my computer on my local network don't really have the same time within up to 1 second or so. So I wanted to make sure that it would be possible for a stack of ...
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35 views

Why is the NTP local fudge server no longer reachable?

For many years I have had: server 127.127.1.0 # local clock fudge 127.127.1.0 stratum 10 In my /etc/ntp.conf configs - it always worked as I expected it to: ie. was mostly useless but for those ...
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256 views

NTP: Should I configure NTP step-tickers in a domain which uses local NTP servers?

I've bumped into something which is called "NTP step tickers" and read about it in this article, but I'm not sure if it's required in a domain which includes local NTP servers. It seems like it ...
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516 views

Best choice for NTP client configuration

Lets see if someone can throw a bit of light on this subject.. I'm making a server installation in the next days. My client wants to deploy a Hortonworks HDP with 2 servers as master servers and 5 ...
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97 views

Nagios' check_ntp_time sporadic socket timeout

Check_ntp_time has been failing on all my hosts sporadically. I usually receive CRITICAL - Socket timeout after 10 seconds And a couple of minutes later check_ntp_time succeeds and shows the ...
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48 views

NTP and iptables for time syncing within and across datacenter locations

I have several linux (Debian) servers across two data centers located on the east and west coast of the US. I picked one server from each location to be a NTP server. The NTP server syncs time with ...
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96 views

Likely causes of NTPD dying unexpectedly and solutions

On a web application which uses s3 for physical document storage, we are experiencing issues with NTP continuously dying. This seems to happen roughly once or twice a day. There is very little ...
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79 views

crypto_setup: host key file not found or corrupt

I need to deploy a ntp server with key authentication. I have Ubuntu 14.04.2 server x86_64 as ntp server and CentOS 6.7 x86_64 as client for test. For setup my ntp server I used this guide. But I ...
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67 views

Error: Failed to apply catalog: Parameter name failed on Package[ntp]:

I am getting the following error while running puppet: Error: Failed to apply catalog: Parameter name failed on Package[ntp]: Name must be a String not Array at ...
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79 views

Building NTP with OpenSSL

I am trying to build the latest version of NTP (4.2.8p3 released on 2015/06/29) with OpenSSL support. I can definitely build NTP but when I try to use ntp-keygen to create a new certificate it tells ...
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Trouble with NTP Sync between ntp servers and VMs

I have many VMs on production that run vmware, with vmtools running and the sync between ESXI and hosts is disabled. I run ntp client on all hosts, the OS of hosts is RHEL. The problem I have is that ...
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36 views

/proc/stat btime value change after boot

In a Linux server with the kernel 3.16, not virtualized, but with the ntp daemon active, the variable "btime" wich gives the time at which the system booted, change a few seconds before booting. For ...
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135 views

Dynamic timezone change for OpenWrt (Chaos Calmer), NTP

I have this idea for my routers running OpenWrt, since for them there is no way of knowing in what time zone they are by default. What if there was a list of lets say three time servers each per one ...
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1answer
252 views

How to solve XenServer Windows guest time driffting issue?

I do have two different Windows VM guests that seem to be drifting time seriously, reaching an offset of 10-15 seconds in less than a week. Both the Windows guests and the XenServer 6.5 host are ...
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45 views

NTP server acting weird

I have an NTP server on the network that is acting very weird. I have not changed any of the ntpd.conf settings. Its a debian box and I did a regular install. I have an NTP client on the network. If ...
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296 views

NTP service stopped in centos7.1 linux machine

In our 3 linux boxes centos 7.1, we saw below messages in the logs and then ntpd service got stopped since the offset is more than 1000s. systemd: Time has been changed ntpd[2626]: 0.0.0.0 0617 07 ...
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110 views

Windows Server internet time server reset after restart

I encountered an issue with Windows Server 2012 (running as a virtual machine), after an unplanned restart: the original internet time server - time-b.nist.gov - changed to time.windows.com. This set ...
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1answer
140 views

ntp.conf pool vs server directives

I came across an ntp.conf file that specifies pool directives: # Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board # on 2011-02-08 (LP: #104525). See ...
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182 views

Linux ntpd leap second preparation

There will be a leap second on June 30, 2015 at 23:59:60 UTC. I have a Linux based stratum 1 NTP server which uses GPS as a reference clock. The server is using the "default" ntp.org ntpd. How ...
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329 views

Time synchronization in an heterogeneous environment

In a mixed environment, where machines can be running under Windows (most), Linux (a few), sometimes Android ... what is the best solution to have time synchronization with an accuracy close to ...
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32 views

UDel ntpd - completely disable time server discovery

I configured UDel ntpd (version 4.2.6.p5) as a client to three servers operated by my organization, and (I thought) no one else. server xx.yy.zz.1 iburst server xx.yy.zz.2 iburst server xx.yy.zz.3 ...
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168 views

How to synchronize the time in Debian6 server? We have 30 min delay in our VMs

I can't have the correct time in our servers. We get always the same delay in the three of them (they are VM on the same server). We use ntp to have our date always synchronized· The main server ...
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126 views

Using public ntp servers for backup to local stratum 1 server

In my data centers, I have access to a stratum 1 server but I set up our servers to use ntp pool servers in addition to it. My main thinking was for backup in case our local server goes down but I am ...