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

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2
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2answers
6k views

How does ntpstat work?

I have installed ntp on some of the network machines I am working on. When I check ntpstat, I see that it says clocks are synchronized to some ms, usually between 12 and 70 ms. My questions are: ...
1
vote
1answer
1k views

Error occurred during NTP sync on Windows Server 2008 R2

I have two Windows Server 2008 R2 Standard servers. The first can correctly sync its time with the default NTP server time.windows.com, but the second cannot. The error displayed is: An error ...
19
votes
2answers
89k views

How can I query an NTP server under Windows?

I am not interested in synchronizing my local clock with the remote server. I only want to query it and print the result. I would have assumed that there is a port of ntpq for Windows, but was unable ...
2
votes
1answer
270 views

Alternative to Qlock [closed]

I work in a NOC that needs to display times from different cities across two 50 inch screens connected to a single windows 7 enterprise box. Currently, we are using http://www.qlock.com/ but I would ...
7
votes
3answers
8k 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?
32
votes
5answers
453k 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 ...
10
votes
2answers
21k 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 ...
1
vote
2answers
11k 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 ...
1
vote
1answer
2k views

How to configure Windows Server & Desktop OS to use multiple Network Time (NTP) Servers?

We experienced an outage in our usual NTP (Network Time Protocol) server - a Linux box that we sync all of our systems to. I am noticing that in the "Adjust Date/Time -> Internet Time" tab I can set ...
1
vote
1answer
3k 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
0answers
3k views

Allow LAN clients to sync time through DD-WRT

I'm having problems when syncing time trough DD-WRT. I have multiple LAN clients and none of them seems to be able to sync time with an internet time server. I have a TP-Link WR1043ND that does this ...
2
votes
1answer
8k views

How to Get Standalone Windows 7 Cannot Sync Time (NTP)

I am trying to get my Windows 7 Professional Machine to sync time correctly. This laptop is not a member of any domain. If I try to go to the clock settings, Internet Time tab, and click on "Update ...
9
votes
1answer
13k views

How to synchronize clocks for computers that are not online?

I have some computers that run Windows 7 embedded and are connected to each other by a switch, but are not connected to a larger network or the internet. After a few weeks, the clocks drift and it is ...
1
vote
0answers
308 views

How to skew a Mac's clock 10 minutes while still keeping it “synchronized”?

My wife is always running late. How can I skew her Mac's clock 10 minutes while still keeping it "synchronized"? I looked at the fudge setting of /etc/ntp.conf but it's only for a Reference Clock and ...
0
votes
1answer
262 views

Can I copy the ntpdate binary from another machine in order to update date & time?

On my Red Hat 5.3 Linux machine, NTP isn’t installed (can't install it for some reasons). However I can copy the binary /usr/sbin/ntpdate from another Linux machine to mine. If I only get the file ...
1
vote
1answer
168 views

Stopping ntp - time is still jumping back in Debian

I do something like: service ntp stop 503 date +%T -s "15:10:00" But after a while it jums forward to the correct time (If I put it forward in time, it seems to be working). This is a VMWare Linux ...
0
votes
0answers
332 views

Change system time and turn off Internet time in Debian/Gnome

Changing the time is easy, but then it is automatically synchronized with a time-server. Before I had access to admin menus, but now I don't, when I click on the clock and try to change, i get an ...
7
votes
2answers
4k 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 ...
3
votes
2answers
9k views

Time problem in ArchLinux

I use ArchLinux and I have had problems with my system time for many months. Previously it was working, but once I updated my PC, the system time was shifted at every startup (like it wasn't ...
3
votes
4answers
2k views

Can you help me find an NTP time server that is synchronised with an atomic clock?

I would like to be able to read the time from an NTP server that is connected to a very accurate time source - an atomic clock, GPS clock, or similar. I can see an accurate clock here (http://www....
3
votes
1answer
29k 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 ...
2
votes
2answers
1k views

NTP sync… doesn't

Following the instructions here, I've manually configured the Windows Time service to use an external time source. As I noticed the server's clock drifts very fast (1s per 40min), I set the ...
0
votes
2answers
9k views

NTP sync on Windows Server 2008

How would you make a Windows Server 2008 server sync with free ntp servers on the Internet? What free programs would do this? How do you configure them? (I need it to sync every 30sec as the server's ...
24
votes
7answers
32k 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?
0
votes
2answers
270 views

NTPd giving the wrong time

Running ntpd -q on a Fedora 14 VM gives the wrong time. I'm in the UK so my time should be UTC+1, but instead it's 6 minutes behind what it should be. Anyone know why this might be and how to fix it?
1
vote
1answer
233 views

How to track when Linux determines time without NTP with some other method?

When a Linux machine with NTP capabilities will start and it does not find the NTP server, how it will determine the time? A clue I have is that it uses some heuristic method but I don't need what ...
5
votes
1answer
1k views

Computer clock drifts on standby. Can I make Windows synchronize time on every wakeup?

My Dell Vostro 1720 laptop's clock drifts when waking from standby mode (even by five minutes sometimes). This is really annoying and sometimes dangerous. I tried decreasing the Windows time sync ...
0
votes
3answers
1k views

Using nc (netcat) to emulate NTP server response

I want to test some security on an NTP client developed in-house and would like to use netcat to do it. I have packets captured with Wireshark from previous NTP exchanges that I tried to feed to the ...
6
votes
2answers
24k 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 ...
7
votes
4answers
71k 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 ...
1
vote
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 ...
0
votes
1answer
990 views

Set Windows system time from command line similar to Linux rdate command

I need to set the time on a Windows 2008 server via an internet clock server from a command line, and ensure that Windows 2008 doesn't do it by itself. I will use this for a .cmd file which looks ...
2
votes
1answer
857 views

Slow connection and NTP

I'm behind a slow connection (Dial Up) with high latency (+400ms). I have recently received a broken MyBook World, which I refurbished and I have Debian installed on it. The problem is, that this ...
0
votes
1answer
111 views

Option to get ntpd to run interactively

I am trying to set up an NTP client on OpenBSD. There is a way to run ntpd 'interactively' so that it tries to connect to our NTP server immediatley and doesn't return until it has updated the time or ...
3
votes
2answers
15k views

How can I view/change/disable the time server in Windows XP, when no “Internet Time” tab?

Normally, the "Date and Time Properties" dialog has a third tab "Internet Time" where you can turn on/off the use of a time server, or change where it points. This tab is missing, and Windows is ...
14
votes
4answers
50k views

how to check if NTP adjusted system time on Linux?

I have a machine that experienced some troubles with some of the real time stuff that I'm running. One lead that I have is that NTP daemon may have moved the time, causing false timeouts. How do I ...
23
votes
1answer
99k views

Where do I find the 'Internet Time' (NTP) settings in Windows 7

In Windows XP you can get to the 'Internet Time' settings (to select a ntp server or force an update) via the 'Date and Time Properties' in Control Panel. Anyone know where this is found in ...
1
vote
1answer
91 views

How to measure synchronisation performance?

I'm looking for a tool for Debian Linux that can measure the synchronisation performance between two desktops. I'm using RADClock instead of the NTP client to synchronise my desktops. Any ...
3
votes
2answers
2k views

Synchronizing time within workgroup

I have workgroup consisting of three Windows 7 computers without access to Internet. My wish would be to synchronize time across all by making one of them NTP server. Is there any free NTP server out ...
3
votes
4answers
19k 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?
2
votes
1answer
1k views

Software displaying the time of an NTP server

Is there any software that can display the time from an NTP server? Irregardless of what is going on with the time in the operating system itself. Like, just enter in the hostname of an NTP server and ...
2
votes
4answers
183 views

Least expensive AND smallest CPU setup

I'm looking to build a very simple NTP clock, nothing else. I'd like to get a small screen and mount a small chassis to the back of it. It's sole purpose will be to display a clock and poll the data ...
11
votes
1answer
9k views

Windows clients not using NTP server provided via DHCP

I have a network consisting mostly of Windows Vista and 7 clients and an Ubuntu server. The server provides both the DHCP and NTP services through dhcp3-server and openntpd. In my dhcpd.conf, the ...
20
votes
1answer
47k views

What are the iptables rules to permit ntp?

My server's clock is wrong because the firewall doesn't permit ntp traffic. What are the iptables rules required to allow the ntp client to get out and back? Any suggestions how to implement those ...
9
votes
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 ...
0
votes
1answer
383 views

ntp.conf sync to local machines

I have 2 linux machines, they do not have internet connectivity or any other means of getting an external clock. I need one of them to act as the "master"/server and the other machine to sync it's ...
6
votes
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 ...
1
vote
2answers
925 views

Mac OS X - configuring ntpd server with on LAN with D-Link DIR-655

This question is pretty specific, but I hope someone will have seen this error elsewhere. I am configuring a machine running OS X 10.5.8 to be an NTP server for machines connected to a LAN that is not ...
2
votes
2answers
4k views

How to initiate NTP update

My MBP currently is not connected to the internet when it is booted. (vacation) now I notice, that each time I return to OS X after a Bootcamped XP game, my system time is of by an hour. (XP and OS X ...
0
votes
1answer
1k views

Using ntpd on Ubuntu for Windows 7 client?

I've just aptitude install ntp on my Ubuntu box, and now I'd like my Windows 7 desktop to synchronize its time with that machine. The Ubuntu box is synchronising with my ISP's time servers correctly: ...