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

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Synchronize Time in Linux

I want to synchronize the time between my android device and a raspberry pi. My android is synchronized automatically from the internet ( GMT + 2). I used this code to get the ntp server. final ...
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1answer
1k views

How can I check whether my NTP daemon has PPS support?

I have already read about compiling NTP with timepps.h provided to get PPS support. Is there an easy way to check the already precompiled or rather installed version of an repository (Ubuntu 14.04.1, ...
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0answers
15 views

Time and Date settings in SSL decryptor

I have a query regarding an SSL decryptor and NTP. This device is connected to a Cisco Meraki box which is in turn connected to a router. Now within the device there is no NTP configuration and ...
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0answers
15 views

ntpdate pool.ntp.org getting lost on slackware

On Slackware 13.1, keep time correct is getting difficult. I've noticed BIOS clock is wrong. So I do ntpdate pool.ntp.org and just after I check time with date. It's correct. I check it again with ...
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2answers
14k views

Where do I find the “Internet Time” (NTP) settings in Windows 10?

In Windows 7, you could get to the "Internet Time" settings by following the instructions in this Super User answer. Now, I can get to this interface, but there is no option to set a custom NTP ...
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0answers
15 views

ntpd clock calculation in absence of ntp servers

We are flying a Linux machine on a high altitude balloon and I was wondering if ntpd would continue to correct for the system clock drift even without access to ntp servers. ntpd has been running on ...
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5answers
427k 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. (I'm working on ...
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1answer
55 views

Cannot connect to NTP server

I am trying to synchronize my clock with a NTP server by following the instructions here http://support.ntp.org/bin/view/Support/GettingStarted , but this works only with some connections, not with ...
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2answers
1k views

Ubuntu time issues

I am having a tough time getting my Ubuntu Virtual Machine to display the proper time. It is on an ESXi server and the version is 8.10 LTS it came with a virtual appliance for Opsview. I have ...
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4answers
19k views

Why is my NTP controlled computer clock two minutes ahead?

The clock in my computer is configured to be synchronized using NTP. To verify this I have tried two NTP clients using various NTP servers. My computer and the NTP clients are in complete agreement ...
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4answers
69k views

Can't synchronize time, Windows 7

Ok, I finally installed Windows 7, clean install. Time synchronization does not work. Clicking "Update now" gives message: Unable to start the Windows Time service. Please try again later. I use ...
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2answers
11k 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 ...
9
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1answer
4k views

How to increase frequency of time server synchronizations?

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 ...
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3answers
7k views

Does it matter which NTP time server do I choose in Windows?

When enabling Windows to set system time via Internet, I'm presented with the following dialog: Does it matter which time server I choose? How would I know if one was "better" than the others?
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4answers
4k views

Sync the clock on Windows 7 to the time server more frequently

On Windows 7, is the way to sync the clock to the time server more frequently still the same as before (by regedit)? Are there other ways such as by using the control panel or system tool?
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4answers
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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 ...
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3answers
51 views

Is it possible to virtualize the clock for an experimental NTP time offset?

I have a project that wishes to force the times of a set of private NTP servers to demonstrate how NTP (and our software) reacts to various time changes and differences, network lag, etc. Normally, ...
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1answer
195 views

Windows 10 time (and date) is wrong on new computers

I've been manually configuring six Lenovo Yoga 500 laptops running Windows 10 home over the last week and they have consistently not been able to get the right time in the UK. These are out of the box ...
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1answer
77 views

NFS fileserver / computer clock not in sync despite NTP setup

I have a fileserver running at home (Synology DS214se) which, among other things, serves my /home/<user> (per pam_mount controlled NFS). This works just fine for all practical purposes, with ...
0
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1answer
39 views

NTP sync issue on client servers

Does starting up NTPD daemon will automatically sync the client server with NTP server? Our server is running 5 mins behind the current time when we checked the service was in stopped state so does ...
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1answer
1k views

'net ads join -U username' failing with an error 'NT_STATUS_IO_TIMEOUT'

I am attempting to provide access to Ubuntu shared directories using Active Directory users and group using Samba. I am following this article to install and configure AD and Unix so that access can ...
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0answers
107 views

W32Time not synchronizing with PDC after /syncfromflags:domhier

We have two domain controllers on a local network: Zeus [PDC] Neptune Zeus is configured to pull from an external time source and is set as reliable: w32tm /config /manualpeerlist:0.pool.ntp.org ...
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1answer
340 views

Windows 10 keeps failing to connect to online NTP server

I would like to keep my time up to date using an online NTP server. pool.ntp.org seems to work for other devices on the network, so that's the NTP server I want to use. When I update the NTP server ...
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0answers
27 views

How to use adjtimex

I have a Debian machine that at the time of configuration will have access to NTP servers. But once configured and in use, it will not have access to NTP servers. What are the steps to ensure that the ...
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0answers
22 views

systemd-timesyncd: Show NTP status

When using systemd-timesyncd, how do you show more detailed NTP status? Specifically, I'm looking for the IP addresses of the peers I'm using (presumably aquired via DHCP). This does not show what ...
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0answers
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NTP not getting through even to DMZ

My home router seems to be blocking UDP 123. sudo ntpdate -u time.apple.com works as expected, but sudo ntpdate time.apple.com I get: "no server suitable for synchronization found" I can get a ...
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1answer
62 views

NTP - fix massive offset

I've got a RHEL 5.4 and I'm synced to my NTP server .... I have managed to reduce the jitter to almost 0 with ntpq -q But then it came right back. The huge offset remains regardless of what I do. ...
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7answers
30k 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?
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1answer
53 views

Will NTP peering help my servers' relative drift?

I have a series of internal NTP servers; every other machine on my network is configured to talk to these servers like so: # ntp.conf for client machines server 0.ntp.internal iburst server ...
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1answer
4k 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 ...
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1answer
252 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
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1answer
356 views

systemd-timesyncd.service start fails

I try to start systemd-timesyncd.service service but it fails: root@xxxx:~# systemctl start systemd-timesyncd.service root@xxxx:~# systemctl status systemd-timesyncd.service ● ...
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1answer
45 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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2answers
61 views

Can Debian detect the timezone automatically from the network?

So on debian I can change the timezone by running # dpkg-reconfigure tzdata Is there a way to have it recognise this automatically (say if I travel to a different timezone and connect to a wifi ...
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1answer
146 views

NTP not syncing immediately on windows

I am trying to sync with NTP server, but server is responding with below messages. Below are the wireshark captures. Flags: 0x0c 11.. .... = Leap Indicator: unknown (clock unsynchronized) (3) ..00 ...
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3answers
13k 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 ...
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2answers
58 views

how to verify firewall rule for a particular service?

How could i check which firewall rules are used by a particular service and whether port is blocked to restrict access by external users? i.e netstat -tulnp | grep 123 udp 0 0 ...
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1answer
1k 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 ...
0
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1answer
28 views

Using ntp across LAN

I have 3 debian computers connected to a network switch across LAN without WAN access. I would like to manually set the date and time on one of the computers, then automatically sync the time to the ...
2
votes
1answer
111 views

DNS and NTP on same box?

I'm using DNS to hold forward zone records for my domain (example.com) and I'd like to add ntp as well so my servers can sync the time and reduce load off of third-party ntp pool. I understand it's ...
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vote
1answer
3k views

How do I interpret w32tm output, especially d:?

I am trying to understand what all the different values mean in the following output. I understand the command below is comparing my local time ("current time is") with time.nist.gov 8:38:08 is my ...
30
votes
4answers
4k views

Windows vs Linux Local Time?

Ever since I started using Linux in dualboot with Windows I noticed that when I rebooted the machine, the time on the other OS was wrong, e.g. it was 12:00 on Linux, then I rebooted and on Windows it ...
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2answers
800 views

Windows 7 Time syncing issues

I've had this issue for a very long time and I often search google for solutions and try whatever I find but nothing works and then I give up, only to repeat the same process a few weeks later. this ...
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1answer
106 views

Syncing to a Cell Phone Companies NTP Server [closed]

Not strictly for authentication, I am looking for a way force my Ubuntu NTP Server to use my cell phone companies network time as a basis for all my in home time. I cannot seem to find the address ...
1
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1answer
5k 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 ...
0
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2answers
148 views

NTP System time different from hardware time

on a centos 6.5 server I've just executed ntp with: service ntpd start It has fixed system time, but hardware time is still wrong. Is this normal? How can i fix it? ntpstat reports: ...
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1answer
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Relativistic NTP

I was wondering whether any provision is made in the NTP standard to synchronize time between machines travelling near the speed of light relative to each other. Does NTP even work in these ...
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1answer
393 views

NTP doesnt sync my time

Im getting problems to sync my local time with the NTP Server. this is the output when u do a NTP Query. remote refid st t when poll reach delay offset jitter ...
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2answers
1k views

NTP - ntpq -c peers showing incorrect stratum for peers

I am running Ubuntu 14.04 as an Amazon Web Services instance. When I run ntpq -c peers on my server I get the following output: # ntpq -c peers remote refid st t when poll reach ...
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0answers
44 views

How to correct the source of time difference between two different server using the same NTP server?

It is observed that there are times when the servers are having time differences as much as 61 seconds. Other times, the servers time are in sync. Please advise on how can these discrepancies can be ...