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

learn more… | top users | synonyms

3
votes
1answer
3k views

Which clients accept DHCP option 42 to configure their NTP servers? [closed]

From what I can tell based on observations of my own OS X 10.8.5 machine, and the information in "Windows clients not using NTP server provided via DHCP," neither OS X nor Windows 7 are able to ...
0
votes
0answers
6 views

NTP out of sync on Debian

I am running Debian latest stable and recently, my clock has been going off by an hour or 2. If I restart the ntp service it fixed it. This has happened a few times in the last few weeks. What should ...
14
votes
6answers
15k views

How to use ntpdate behind a proxy?

Is it possible to use ntpdate behind a HTTP proxy with authentication? In case it is not possible, are there any good alternatives?
6
votes
3answers
16k views

I get “An error occurred while Windows was synchronizing with [name of time server].” when trying to automatically synchronise PC time

Prompted by the answers to this question I decided to give the Windows built in time synchronisation another go. However, no matter what time server I use I get this error: "An error occurred while ...
0
votes
1answer
26 views

unable to install ntpdate on centos

I'm running centos 6, unable to get ntpdate working, what's wrong? ntpdate pool.ntp.org bash: ntpdate: command not found x yum install ntpdate Loaded plugins: fastestmirror, security Loading mirror ...
3
votes
3answers
4k views

What happens when router has been set to incorrect time?

I have a D-Link router for my home Wi-Fi network. Everyday at least once the internet suddenly goes down. I am simply not able to connect to the Wi-Fi network. If I just restart the router, it starts ...
-1
votes
1answer
51 views

Write Internet Time to a file from windows command line

I want to write the time of an internet time server to a text file from within windows server 2012 command line. Does someone knows how to do that? Thanks!
0
votes
0answers
44 views

How to setup a NTP Server on Freshly installed Windows Server 2003?

I am to replicate a scenario of a deployed site in which they use the Window's Time Sync feature (found in this tutorial) to connect to a local time server and synchronize their time. So I prepared a ...
0
votes
1answer
32 views

Questionable NTP Traffic at Firewall?

I checked my firewall logs and noticed odd traffic patterns for NTP or UDP/123 (shown below). I don't understand the round robin'ing that's occurring from my hosts. And I don't understand why its ...
1
vote
0answers
77 views

NTP Multicast configuration

I'm trying to get NTP multicast set up between a few computers. Right now I'm getting NTP multicast packets from a computer that I have neither access to nor information on (let's call that A) that is ...
5
votes
1answer
180 views

NTPD: drifts away from system clock

Using RHEL 5.x on a workstation. I set the clock using ntpdate 0.us.pool.ntp.org and then start NTPD using service ntpd start. (this also happens at boot). Watching this over the next 20-30 minutes ...
2
votes
0answers
311 views

Why does NTP require bi-directional firewall access to UDP port 123?

From What are the iptables rules to permit ntp?: iptables -A INPUT -p udp --dport 123 -j ACCEPT iptables -A OUTPUT -p udp --sport 123 -j ACCEPT Also, from the NTP website: ... ntpd requires ...
1
vote
0answers
69 views

NTP syncs with ntp.ubuntu.com but not with the pool options

I am trying to configure my ntp server to synchronize with ntp servers available online. Below is my /etc/inet/ntp.conf and my ntpq -p output # ident "@(#)ntp.server 1.6 00/07/17 SMI" # # ...
0
votes
1answer
698 views

Motorola MC3190 - Windows CE 6.0 configure device time through registry

I have to configure a Motorola MC3190 running Windows CE 6.0 to use a time server to automatically set the time after a cold boot, including the timezone. This is my current configuration, found in ...
1
vote
0answers
74 views

how to trace and correct the source of time difference between two different clients having the same NTP Stratum 2 source

My standalone server is connected and taking time from a dedicated NTP hardware that is synced to UTC through GPS. All clients in the network are connected to this stand alone server and the clients ...
45
votes
4answers
3k views

NTP - How are NTP servers so accurate

I've noticed that on my servers and other machines the clock always drifts so it has to sync up to remain accurate. How do the NTP server clocks not drift and always remain correct?
3
votes
2answers
2k views

Public, reputable sources of time sync via HTTP to use where NTP is blocked?

Let's say I'm in a corporate network where the NTP protocol is blocked, the BOFH^H^H^H^H sysadmins won't unblock it, and they didn't bother to set up a good internal NTP server. What's a good source ...
4
votes
2answers
6k views

Determine the time difference between two linux servers

I am troubleshooting a latency network issue on a network. It is probably a nic or cabling issue, but while I was going through the process of figuring it out, I was looking at the timings of a ping ...
12
votes
3answers
19k views

Updating Time : ntpdate[3108]: the NTP socket is in use, exiting

The time on my system is incorrect for some reason. i need to run an update but i can't seem to be able to this is the errror. ntpdate pool.ntp.org 31 Aug 12:31:59 ntpdate[3108]: the NTP socket is in ...
0
votes
1answer
78 views

Daylight savings issues in windows, possibly related to NTP sync

We have an app deployed to information kiosks across a number of sites, where employees of our client can log in and sign-on/off their shifts and view timesheets etc. Approaching every daylight ...
1
vote
2answers
5k views

My system clock is an extra (extra) hour ahead during BST/ daylight saving

I have a problem when my Windows 7 64-bit laptop is used during BST (British Summer Time)/ daylight saving periods. Instead of the +1 shift in time, the system clock shifts +2 hours and can be a few ...
5
votes
2answers
12k views

How to synchronize to a NTP server on Windows XP?

My Windows XP doesn't have the synchronization tab under Control Panel > Date and Time settings. I tried to change the related registry settings, and it worked only for my Windows 7. What else should ...
0
votes
0answers
289 views

Implications of disabling VMICTimeProvider (Windows7)?

I have a private network of two machines: one is Windows 7 and the other is not windows. I want the Windows7 machine to run an NTP server for the non-windows machine to synch to. The instructions in ...
2
votes
1answer
423 views

Windows 8 w32tm clock drift correction

I am running Windows 8 (no virtualization, X79 + i7-3820), and have separate Linux NTP server in my local network. Linux NTP is typically within 1ms of true time. I've set Windows 8 to synchronize ...
0
votes
1answer
120 views

Serving manually set time

I have set my NTP config to this: # local server server 127.0.0.1 fudge 127.0.0.1 stratum 10 # Only allow read-only access from localhost restrict -4 default kod nomodify notrap nopeer noquery ...
0
votes
0answers
83 views

ntpd & ntpdate won't set time

I recently purchased a new development board and, unfortunately, the edition of Linux provided doesn't sync with an NTP server automatically. I have tried using "ntpd -dgq", however the output is ...
0
votes
0answers
973 views

Sync windows 8.1 time with NTP server when boots up?

I have an issue with BIOS causing time to be reset in 9 of 10 times when system boots up...While windows 8.1 somehow trusts the time from BIOS more than NTP, how can I force the windows to sync with ...
1
vote
1answer
541 views

NTP client not update

I have many linux Virtual machine on ESXI, I have configured one linux machine as NTP server and that server is updating its time from NTP server over internet, this server is working properly and ...
0
votes
1answer
157 views

5 Feb 16:53:26 ntpdate[414]: no server suitable for synchronization found

I want to setup ntp in beaglebone based custom board. /etc/ntp.conf file content is as mentioned below driftfile /var/run/ntp.drift server pool.ntp.org server 1.in.pool.ntp.org server ...
1
vote
2answers
373 views

Setting Time in Lubuntu

I have a time server running on a server PC that is meant to change the times of various guest PCs as a result of a TCP/IP command on port 9000 issued by a control application running on an integrated ...
2
votes
0answers
134 views

Godaddy fails to properly configure NTP on their node server hosting my VPS [closed]

I have a few VPS servers with Godaddy and with every new server I contracted I had to ask them to set up NTP on the node hosting my container. They always did until now. It seems like their ...
2
votes
2answers
1k views

How to correctly sync time in linux running as virtual guest after host resumes from hibernation?

I use multiple virtual boxes for development and correct time and date is important for me when I push git commits. I do not shut down my host - it runs for months without restarting. I only hibernate ...
0
votes
1answer
483 views

Why does my router send an NTP request to ntp.nasa.gov?

I have enabled logging on my router and restarted it. At the end of the log file it says: Sat, 2000-01-01 02:02:19 - Send out NTP request to ntp.nasa.gov Wed, 2014-01-15 18:01:39 - Receive NTP Reply ...
0
votes
2answers
192 views

Can I use different server IP address in NTP time synchronization?

By default, it is something like, server 0.rhel.pool.ntp.org server 1.rhel.pool.ntp.org server 2.rhel.pool.ntp.org Can I choose my server IP address for synchronizing time?
7
votes
1answer
3k views

How to increase frequency of time server synchronisations?

I have a that PC (Windows XP SP3) keeps losing time whereby it ends up being about 5 mins slow per day from all the other PCs and clocks about the place. Is there a way to increase frequency of ...
3
votes
1answer
16k views

NTP sync on Windows 7

How would you make a Windows 7 machine sync with free ntp servers on the Internet? This details for Windows Server 2008, but after tweaking the registry and trying to restart the service, it doesn't ...
1
vote
0answers
60 views

How should I troubleshoot a Qnx ntp synchronisation issue?

I setup the w32time service to act as an ntp server, and it has been confirmed on at least one other client (MacOS X). I've used a few different utilities in Windows that indicate that there indeed is ...
0
votes
2answers
563 views

How to setup robust Windows time synchronization?

I have an incorrect time on my Windows machine. I'm not sure how to specify the proper timezone and setup an NTP synchronization. When i'm using a dualboot configuration with Linux (Ubuntu) my time is ...
2
votes
1answer
671 views

How long does it take NTP to “sync up”

Assuming "sync up" means achieving similar (~1ms) times, how long does it take to: "Sync up" my local computer to an NTP server? "Sync up" my alternate local (networked) computers to one central ...
4
votes
1answer
432 views

NTP daemon or ntpdate doesn't synchronize

I'm having some problems with synchronization with an NTP server. 1) The NTP daemon doesn't sync the system clock at all, even though it's running (confirmed with /etc/init.d/ntp status). Forcing to ...
0
votes
1answer
169 views

Why ntp settle time too long?

I simply try to set-up NTP to my system. Both server and clients will run on my computer which are linked together with local link. One of them will have the reference clock. Both the server and ...
2
votes
0answers
94 views

Will a Linux NTP server with an upstream Windows time source have any less jitter?

For my infrastructure we have a platform which cannot synchronize over NTP to a W32time service due to too much jitter from the Windows time source. So my question is, if we have a W32time source ...
1
vote
1answer
908 views

How inaccurate must the clock's time be for NTLM requests to be denied due to the time being incorrect?

We have a network where the time on some of the client workstations is inaccurate. There is a problem with NTP on the clients or domain controllers causing the time to not synchronize. We are ...
2
votes
2answers
3k views

NTP no server suitable

Been trying with a lot of configuration, following different tips but cant get it to synchronize with a server, ntpdate -u 192.168.1.100 3 Oct 01:01:13 ntpdate[11170]: no server suitable for ...
2
votes
2answers
812 views

Os X - Why do I need to turn on WiFi to determine closest location

Why do I need to turn on WiFi to determine my closest location? For some reason, my mac won't get the latest time from the NTP server if I am plugged into Ethernet. What could possibly be different ...
4
votes
3answers
2k views

How to know current time from internet from command line in Linux?

How to know current time from internet from command line in Linux? For example, with ntpq program? Note: not from computer or operating system clock, but from internet? Note: I don't want to CHANGE ...
1
vote
4answers
10k views

Mac OS X Date & Time Synchronization

When I have set Mac OS X to set it's date and time automatically, how often is this really done? And is there a way I can force an update?
0
votes
2answers
1k views

Archlinux wrong localtime

Here is datetimectl output, Why local time is not set to Universal time? And I have enable ntpd service. The local time should be Sun 2013-08-11 21:45:21 UTC. Local time: Mon 2013-08-12 ...
1
vote
2answers
2k views

How to connect to time server behind corporate firewall/proxy server?

I am setting up an internal web server at big company and we recently changed proxy servers companywide. So time sync won't work. Tried all of the W2008 defaults, tried resetting the time service... ...
13
votes
3answers
175k views

How can I check a system's current NTP configuration?

I need to verify the current NTP configuration on some Windows systems. Ideally, I'd like to be able to do this via command line instead of navigating through configuration screens (especially since ...