Questions tagged [ntp]

Network Time Protocol, used to synchronize clocks on the Internet.

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NTP server, port not open

So, I'm trying to install an NTP server on this Windows 10 Home computer. I've tried various tutorials to enable w32time's server mode, and then when that failed I eventually installed Meinberg NTP, ...
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ESXi NTP Time Difference, GMT +1 and UTC

I have gone through too many sites that talk about NTP on ESXi and the inability to change ESXi timezone. So my concern here is that my time zone is GMT +1 and the ESXi time is UTC which is GMT 0 this ...
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NTP time synchronizes, still shows local time..?

I have set NTP time of Canada (0.ca.pool.ntp.org, 1.ca.pool.ntp.org, 2.ca.pool.ntp.org, as obtained from https://www.pool.ntp.org/zone/ca). The sync server IP is 192.210.199.110 (stratum 2). When I ...
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Debian: Set persistent custom time

I try to set a custom time on my (fresh installed) Debian system. For example, I want to set my time to 2013-05-05. So I disabled NTP on my system with timedatectl set-ntp false, verify that ...
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8 views

Pull time from ntp instead of os

I want to show the current time but I don't want to use "os.time" because the user can always change their operating system time and thus also the time displayed on my script. Is there a way ...
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66 views

Access Denied - Windows Time Service is not started - how to disable error message

I'm trying to configure a Windows 10 system to send to a customer. It's mostly done, but I've started getting an message after logging in in a dos box as follows: [SC] open service failed 5: Access is ...
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2answers
255 views

Enabling dynamic DNS updates in iptables

I have a Debian machine behind a wifi router. The machine is running a cron script to restore connectivity whenever a ping to a pre-defined host fails. I have set up iptables so that only the required ...
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103 views

Windows 10 as NTP Server not sending responses

I'm trying to configure my Windows 10 PC to act as an NTP server. I followed the steps here. However, when I look in wireshark, I can clearly see the NTP poll commands coming from the client, but I ...
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1answer
94 views

Hosting an NTP server on both NICs

I’ve enabled the win32time service to host an NTP server on a machine with two NICs. Each NIC is on a different network. I can query the time server from one of the networks, but not the other. Can I ...
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38 views

No matter what I do, windows time keeps going out of sync

Last week, I built a new computer. I have 2 SSDs, one with a Ubuntu installation and one with a Windows 10 installation. Every day, when i boot into windows, the time is out of sync. The BIOS time and ...
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Why does Windows 10 time service not sync immediately?

After rebooting my PC (Win 10 Pro, 64-bit), I found that my time was off by slightly more than 1s. I have an application that requires the time to be set more accurately than that, so I went into ...
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Changed UTC time dumps after reboot in Arch Linux

I use Arch Linux OS with Linux 5.4.61-1-lts kernel, x86-64. I noticed, that my UTC time is wrong: [tao@dc ~]$ timedatectl Local time: Sun 2020-08-30 12:15:41 EEST Universal ...
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67 views

NTPv4 Pool: Origin Timestamp is randomly filled in servers response - why?

The NTPv4 server responses I get from pool.ntp.org servers (requested with chrony 3.5) have random filled values in the 64 origin timestamp field. I can't figure out why. I can't find any information ...
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1answer
2k views

NTP Time - Get time of remote NTP server in command line

Essentially, I want to get an accurate time from a public NTP server, in DOS or powershell. I know there's the w32tm which can query a remote ntp server, but the result it gives is how much out my ...
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How is the update-leap command broken?

In a web page offering guidance on installing the NTP time daemon, it announces that the update-leap command is broken and recommends doing the following command to fix it: sed -e 's/"(\\S+)"...
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interpret ntpd configuration used on raspberry pi

I am still very new to the nptd program so my question should be relatively general. I understand that the program slowly adjusts device's clock rate and syncs to the server time through polling. In ...
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2answers
38 views

How to find a process that runs hourly

CentOS 7, set it up about 3 years ago, so I might not remember every decision I made... Once an hour, something does a time update. I don't have ntp installed, only ntpdate. Don't have chrony ...
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2answers
49 views

How do the major OS like Windows, Mac and Ubuntu/Redhat handle DST and time that goes back 1+ hour?

When time is out of sync, I understand most of the modern operating systems have NTP software that do it in smart increments spreading it through a large interval such that it doesn't affect most ...
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1answer
2k views

Cannot sync with any NTP server on windows 10

I'm trying to sync my windows10 with ANY NTP server but whatever server I use, I'm always receiving timeout. I have tryed setting few different server in "Internet time settings" but in every try i ...
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2answers
425 views

is there any option ntpq for the ntp server connectivity test like ntpdate -d command?

Is there any option ntpq for the ntp server connectivity test like the ntpdate -d command? ntpdate -d ntpserverip This command shows the suitable ntp server for synchronization. What the ...
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1answer
141 views

Windows 10 forces time sync/update with setting disabled

I have Windows 10 in a VM to run some tests, some of which require me simulating a different or "wrong" time. However Windows 10 seems to force the clock to the current time despite the Set time ...
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59 views

Can I use the IP of an internal private NTP service instead pool.ntp.org spublic service with ntpdate?

I am not so into Linux and I have the following problem syncronzing two Linux machine using ntpdate. I know that I can do it running this command: ntpdate pool.ntp.org that creats the timesync.sh ...
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1answer
10k views

Unable to sync Windows 10 time with time servers

I have a new, OEM installation of Windows 10 that is unable to contact any time servers to sync the system time. Each attempt gives me a timeout error, and pinging the time server times out as well. ...
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1answer
448 views

NTPD Service Won't Start on System Boot

Even though ntpd has been enabled, it won't start on system boot. I can issue a "systemctl start ntpd" command that will successfully bring up ntpd, but after reboot ntpd.service goes to inactive (...
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1answer
216 views

ArchlinuxArm on Raspberry: Can't sync datetime at boot

I have a raspberry pi I use for an irrigation system. The problem is it doesn't have hardware clock so, every time it reboots, the system time is wrong, and I cannot set it to sync it automatically. ...
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Time running out of sync on a CentOS 7 server

i have a problem with one of our webservers running on a CentOS 7. The local and UTC time on the system has been changing for about the last 1 to 2 weeks regularly by several minutes and hours. The ...
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1answer
118 views

Ways to accurate synchronize clock with linux

I have a computer that doesn't has internet, I put NTP to sync with a USB GPS and serve NTP to other computers. That's working, but sometimes the server is not suitable for synchronization and I need ...
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23 views

ntp + ntp loose synchronize each time in 5:00 morning

we have a very strange behavior we have 12 Linux redhat machines - redhat 7.x two of these VM servers are loosing the time synchronize each day at 5:00 in the morning after we restart the chronyd , ...
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49 views

NTP does not syncronize with debian 9.7 and hence date and time are not correct

setup: Client - Debian 9.7 Server - Windows 10 with "Absolute Time server" application running for synchronization Sharing below details NTP deamon process gets started on Debian 9.7 client ...
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73 views

Troubleshooting NTP mystery, any ideas?

Task: NTP to a local Synology box (NTP is turned on on the box). Observations (AV and firewall turned off for testing): My C# code (unchanged from when it used to work): Timeout on the receive ...
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1answer
828 views

Windows “Internet Time” can't reach time server, but w32tm can

This is a very strange problem: I can't synchronize time using the Windows Internet Time dialog, because I get a "Peer is unreachable" or timeout error. Temporarily disabling the firewall doesn't help....
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1answer
2k views

Windows 10 is ignoring time changes on Samba 4 DC

I have got and VM with a Samba 4 installed as AD DC. It is also NTP server and the time on the server is correct. Tested with ntpdate -q ntp-server, which gives the correct time and date: ntpdate -q ...
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3k views

Computer time does not auto update to current time windows 10

I have a table with Windows 10 version 1803 This table attached to a cellular router(meaning the router have SIM inside him to provide the internet). but for some reason the time and date on the ...
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1answer
40 views

Time accuracy and network performance

Does an inaccurate clock on an router, modem, affect network performance? Today I was troubleshooting videos loading poorly on my PC. During this I decided to look at the statistics on my modem and ...
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1answer
41 views

Is there any way to validate NTP asymmetric keys

I am working on implementing NTP authentication by asymmetric key (autokey). I just want a way to validate those keys. Is there any utility in ntp-keygen to validate them? Any suggestion is ...
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170 views

How to write CMOS time?

I have a fairly new computer (i.e. not likely BIOS battery problem), and every time I boot/reboot the time is off by ~2 seconds. To fix this, I every time have to set my time manually, and then run ...
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491 views

Meinberg NTPD for Windows timeouts and not finding files

In my network, I have a reliable NTP server which all PCs are synchronized to. Due to the various problems the Windows Time service is known for (at least in Windows 7 and lower versions), I have ...
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1answer
2k views

Managed Switch (HP 1820) doesn't synchonise time with NTP Server

I'm trying to set up a managed switch (HP 1820). So far everything works, but the time doesn't synchronise. The switch is configured correctly in terms of the IP-Settings (IP/Sub/Gateway - no DNS ...
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1answer
1k views

Windows Server and AD - Disable time sync on logon

I have a MS AD domain with some application servers all running Windows Server 2012 R2. The application has a special requirements: time shift between its database and the app servers must be less ...
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1answer
102 views

Configure Rapberry Pi to take time from Windows PC

I have a Raspberry Pi and Windows 10 machine, they will be connect directly via RJ45 and on the same subnet so they can communicate. They will both be completely offline with no access internet access,...
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1k views

instantaneously sync time via NTP after large offset on win10

One of my Win10 machines has a large time offset, in the order to weeks (its a VM that gets unpaused on request). In the age of short-lived SSL certificates, it is crucial for many (web-based) ...
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370 views

MITM redirecting to my own NTP server, blocking traffic to Apple NTP pool

CONFIGURATIONS ipv4.forwarding 1 (ON) arp_cache_poisoning between VICTIM & D.G.. (192.168.1.100 & 192.168.1.1) **LAN** VICTIM: 192.168.1.100 ATTACKER: ...
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2answers
7k views

What is Windows's time server synchronisation precision? (and does it compensate the ping time?)

For the project described in Application of this question I need the best time clock precision possible, and one solution is to have a precise synchronisation of the computer's real time clock. What ...
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30 views

Ubuntu: how to check when system clock was adjusted

I'm trying to figure out when the ntpd adjusted the system clock on Ubuntu 17.10. The ntpq -pn utility shows when the client synchronized with the server last. But it doesn't show when it desided to ...
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1answer
189 views

Time sync with NTP on Vmware Fusion VM

I built a Centos 6.9 VM in VMware Fusion with Synchronize Time turned off and I followed this doc: https://kb.vmware.com/s/article/1006427?sliceId=1&dialogID=373948728&docTypeID=DT_KB_1_1&...
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437 views

ntp sync issue after setting time with date command

one of our servers had not accessed the time server for a long time. After access is turned on; my colleague has notice date is wrong and setting time with date command. After this I have restarted ...
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231 views

How can I use my local time as the only reference of `ntpd`?

I want to let my Linux device synchronize its local time with the local time of another Linux server without any other references. I don't care about the actual time. I want my fake time. Therefore I ...
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1answer
509 views

Avoid dhclient-script overide ntp on amazon linux ami

We're using emr cluster on amazon webservices 'aws'. We are using default 'Amazon Linux AMI' images without customization. It looks to me that the dhclient-script is fetching configurations from our ...
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1answer
3k views

How to use secure NTP authentication from Windows client to a Linux Server?

I have a NTP Server running on a Linux (Ubuntu 16.04) box and I also have to securely serve a bunch of Windows Server boxes (2012, 2012 R2 and 2008 R2 mainly). For network equipements and Linux ...
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2answers
339 views

How to configure NTP over cross-over cable?

I'm fairly new to NTP. I have two computers running Lubuntu 17.04 that I'd like to keep in close time sync with minimal hardware. There is no need to sync to real time, just to keep the system times ...

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