Questions tagged [ntp]

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

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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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Windows 10 network-specific NTP server

When I am at a particular work site, it is necessary that my computer use the local NTP server to maintain close synchrony with various objects on that network. The NTP server at that site is not ...
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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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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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Clock drift on mac despite automatic synch enabled

I have a 15" 2017 MBP running Catalina 10.15.3. In Date & Time Preferences I have long had Set date and time automatically enabled, but recently I noticed that whenever I got a calendar alert it ...
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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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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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31 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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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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How do I configure NTP with gpsd using a multiplexed pty device

I have installed kplex to help multiplex my serial NMEA GPS sensor. I have this configured to generate a pty device called /dev/pts/1 when I reference this using gpsmon it renders the NMEA data ...
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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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133 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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154 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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Kerio Control Time synchronization fails

I'm trying to put my Domain Controller as NTP Server in Kerio Control setting. but I keep getting the Error:"Time synchronization failed" in the Kerio Control log. I tried other online NTP servers ...
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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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60 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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Centos NTP vs AD

My machines with Centos refuse to sync with NTP server running on Windows AD controller. Offset value seem high and the AD presents itself as stratum 1, but in reality is stratum 4. Could this ...
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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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NTP synchronization Windows 10

I have 2 Windows 10 PCs and I need to set one of them (PC1) as NTP server for the other one (PC2) and, generally, other objects of my system (Linux Machines). On PC1 (server) I simply activated the ...
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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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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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301 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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870 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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2k 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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39 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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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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146 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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321 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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1k 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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968 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
70 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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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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5k 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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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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168 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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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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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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446 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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2k 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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287 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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3k views

New managed Netgear switch won't sync to time server (stays on “local” not “SNTP”). What settings should I be using?

This is nuts, I know. But I cannot get my new Netgear switch, to pick up the time from the time server used on the LAN. I've tried both CLI and GUI, I can't work out what it needs. The LAN has a ...
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482 views

How to configure the local RHEL server as NTP Server

I am trying to configure local RHEL server as NTP Server. But the "ntpstat" showing unsynchronised. Local host ip address : 192.168.1.122 /etc/ntp.conf server 192.168.1.122 prefer # local clock ...
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8k views

Unable to synchronize Windows time with local NTP server

I have installed NTP server on a machine in LAN (pfSense), unfortunately, Windows can't synhronize time with it Why and how to fix?
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Windows Server 2012 R2 PDC has no internet time tab

Clients on our domain get their time from the PDC, but the time on the PDC keeps on drifting forward about 5 minutes every few days. All the solutions I search say to log on to the PDC and change the ...
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clockdiff versus ntpdate -q

I want to know the time difference between the clocks on two different hosts. I've found clockdiff and ntpdate -q both perform similar functions. Please provide some insight on the difference between ...
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Why does server time goes behind than ntp server?

Suddenly one of my Linux VM is two minutes behind than the ntp server. I restarted NTP and it got fixed. I should have run ntpq -p before restarting. :-/ 10 days ago it became 2 minutes behind, ...
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18k views

Windows Time not synchronizing - “Access is denied” error

My Windows 7 computer's time drifts every time I reboot, and resynchronizes either not at all or sporadically. When I go to Date and Time > Internet Time > Change settings... and click Update now, I ...
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497 views

Is there solution for Windows Server to use MD5 certificate NTP source validation/authentication?

Is there a built-in or third party solution for Windows Server to use MD5 certificate NTP source validation/authentication? If it is built-in, what version of Windows Server and what is the feature ...
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ntp client does not work with DD-wrt using PPPOE as wan

ntp client does not work with DD-wrt using PPPOE as wan tried different firmwares, facotory resets, different routers cant get it to wrk.. works fine with 2009 firmware on wrt54g (works with default ...

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