13
votes
2answers
487 views

What can be done to improve time synchronization on networks with sporadic internet access?

I'm looking for advice setting up time servers for a very non-typical network. I support many closed networks that have occasional access to the internet. A network would get access most days for a ...
1
vote
1answer
66 views

Domain member as ntp server for other (non-domain) network

I am attempting to synchronize the date and time for a number of computers belonging to a non-domain, statically configured network (e.g. computer B in illustration) with a node which is residing in a ...
2
votes
0answers
57 views

System clock jumps over 50 seconds randomly

Having a really strange and frustrating issue with system clocks across a few (non virtualized) Ubuntu 12.04 servers. The system clock jumps unpredictably by over 50 seconds. Here's a part of the ...
1
vote
0answers
66 views

ntpd -gq do not working on CentOS 6.4

when I'm running 'ntpd -gq' from CentOS 5.10 (i686) the time is synced, but in CentOS 6.4 (x86_64) the command gets stuck (I need to stop it using ctl+c). Any idea hoe to fix it? EDIT: iptables ...
3
votes
1answer
51 views

Synchronizing RODCs to NTP servers?

I've read this nice article from Gareth Hooper regarding Domain Controller syncing to external time sources. In essence, he wrote that although Microsoft don't actually condone the practice, it's a ...
4
votes
2answers
839 views

Active Directory Time Synchronisation - Time-Service Event ID 50

I have an Active Directory domain with two DCs. The first DC in the forest/domain is Server 2012, the second is 2008 R2. The first DC holds the PDC Emulator role. I sporadically receive a warning ...
1
vote
1answer
140 views

ESXi host time not syncing with NTP servers

I have 2 NTP servers (AD 2003 machines) and some ESXi hosts, which are configured to sync time from these 2 servers. I found the time is not in sync between these hosts and servers. And time in each ...
2
votes
2answers
165 views

ntp server that syncs with other ntp servers but supplies a modified utc

Question We need to create an ntp server that syncs against other ntp servers but gives its client a modified utc. For example, it will receive utc 5:17 pm but it's clients will receive utc 7:17pm. ...
1
vote
2answers
140 views

Clock skew on my VPS server

I am having a problem with the time on my VPS hosted at Rackspace. Its running Red Hat Enterprise Linux 5.4. Date commands gives a time which is 11 minutes ahead of the actual time. I am running ntpd ...
0
votes
2answers
230 views

How to clear/flush ntp server peer in Centos

We were using centos.pool.ntp.org for our clock sync among servers. Now we do ave a local NTP server, but the problem is servers are using the old ntp. From centos.pool.ntp.org we can see, ...
2
votes
1answer
610 views

Manually syncing comp clock with DC works, but after a minute - clock incorrect by 5 minutes

The problem: DC1 Clock: 17:23 AD joined client clock: 17:28 After client> w32tm /resync time is in sync, but the clock again jumps forward for 5 minutes for client. It always happens in less ...
2
votes
2answers
226 views

using NTP protocol for internal time synchronisation

I have two embedded system that are connected via ethernet. I want them to run synchronously. Using NTP protocol is an option to synchronize them. But this is a isolated system. I don't have an ...
0
votes
1answer
132 views

Why running ntpdate one after one dosnt set offset to 0

I am running ntp update , one after one (with sec between them), In the log i see that there is always an offset , even if update was run few sec ago. Why is that?Is there a chance to get 0 offset? ...
2
votes
1answer
9k views

How to change time source from “Local CMOS Clock” to “DC”

In a domain, I want to set DC as time server. To do that I use this command: w32tm /config /manualpeerlist:europe.pool.ntp.org /syncfromflags:manual /reliable:yes /update and w32tm /resync ...
2
votes
5answers
2k views

Does CentOS 5.4 properly handle leap seconds?

Apparently the IERS have announced a leap second due at midnight, June 30th this year. Is CentOS/RHEL 5.4 properly updated to support/transition along with updated NTP systems? I was under the ...
2
votes
3answers
443 views

Should I timesync against PDC Emulator or NTP timesource? (PDC not in hub)

I know the best practice would be to have the PDC Emulator to sync against an external NTP time source, and have all other domain controllers sync against the PDC Emulator. However, my network layout ...
0
votes
2answers
88 views

Timekeeping between various Windows computers on network (but not all)

I have a situation where I have the following setup: ============Primary Network=============== = = Bridging Server = ...
2
votes
1answer
4k views

NTP not syncing, only syncs on service restart

My ubuntu 11.10 server has been sitting there quite happily for the last 3 - 4 months, then suddenly the time started going out of sync by one hour. I'm not sure why, nothing has changed re the ...
1
vote
2answers
1k views

State of the art auto time sync? [closed]

Placing ntpdate into cron seems to be no longer a good idea. What is an easy state-of-the-art automatic environmental friendly ;-) sleek way of keeping a (debian) server's time clock up to date?
3
votes
2answers
662 views

Increasing time difference between Windows Server 2003 and time.nist.gov even after explicitly syncing time

I have synced the time of my server to time.nist.gov. This server communicates with a client’s server which is also synced with time.nist.gov. After noting that we seemed to be out of sync with the ...
2
votes
1answer
601 views

Windows NTP client changes timezone to Pacific automatically

I have a Windows 2008 server machine and I am trying to use this public IP 128.252.19.1 to synchronize the time, however, I would like my system to have Eastern timezone. When I enter the ...
2
votes
1answer
783 views

How to return to Default settings of NTP/Time server on domain with GP

This is an Edit - according to the comments, I may have not been understood/ Facts: I have a Windows 2003 Domain PDC Emulator is enabled and working correctly on my DC I have a GPO that is NOT ...
1
vote
5answers
876 views

precise time synchronization of solaris servers with NTP over LAN / WAN

I have 2 servers on a LAN that I want to precisely synchronize. the goal is to have a time difference < 500 microseconds, constant, with no drift (from what I've found on the web, this is ...
3
votes
2answers
586 views

What increments stratum in NTP?

Sorry, it's just not that clear to me from the man pages, Wikipedia, etc. I understand the concept of stratum 0 as an authoritative time source and stratum 1 as the connected server. However, I am ...
0
votes
4answers
2k views

Sync time of W2k8 server to another W2k8 server - non domain controlled

I have multiple W2k8 R2 servers and one of them uses an outside source to constantly sync time. I'd like to sync all my other servers to that server. This is a simple workgroup and no domain ...
0
votes
2answers
383 views

PDC not syncing time properly

Running 2003 as my PDC and I cannot get the time to sync properly. I've tried to sync with windows and nist with no luck. It does not appear to be blocked by the firewall (verified with w32tm ...
1
vote
3answers
251 views

What is the most simple way to automatically update the time on a server?

On ubuntu server my usual solution is just to install the ntp package and call it a day. This installs all the binaries I need and has ntpd start at boot time. Right now I'm working on a server ...
2
votes
3answers
3k views

Time Drift on VM servers, need a reliable solution

We have some windows server 2008 VMware instances on multiple physical servers (hosted) and an application which requires the time to be synced across the server instances. Obviously, VMware has ...
0
votes
1answer
157 views

Clock battery broken on Solaris - how to workaround until I can fix the battery

My main Solaris server has an issue with its battery and thus I lose around 20 seconds per day. Currently I am using rdate once in the morning to synchronise the time. Which approach should I use ...
8
votes
4answers
13k views

How to set a frequent period for NTP client to sync with the NTP server

I've setup an NTP client for my DC to sync time with time.windows.com but I want it to query the NTP server at least twice a day. I made all the changes via the registry, is there a period registry I ...
1
vote
1answer
3k views

High time accuracy on Windows Servers - alternatives to w32tm?

Microsoft's Windows Time Service is not designed to, and does not maintain second accuracy: http://blogs.technet.com/askds/archive/2007/10/23/high-accuracy-w32time-requirements.aspx What software is ...
2
votes
2answers
6k views

Time not propagating to machines on Windows domain

We have a two-domain Active Directory forest: ourcompany.com at the root, and prod.ourcompany.com for production servers. Time is propagating properly through the root domain, but servers in the child ...
4
votes
3answers
10k views

NTP is running, system clock still not in time - what gives?

A Debian Stable (5.0.3) server is running ntpd, and connected to the internet. Still, the system clock is about 5 minutes wrong. $ /etc/init.d/ntp status NTP server is running.. Relevant parts (I ...
1
vote
5answers
892 views

Accurate Timekeeping for Windows Server 2008 VMs without Domain Controller

I'm looking for guidance on how to best configure a group of four Windows Server 2008 VMs (two on one host, and two more on another), so that they maintain accurate time, across reboots/shutdowns. ...
1
vote
3answers
499 views

Synchronise client to internet time server from within a domain

Our infrastructure team have bigger things to worry about right now than the network time being 2 minutes out (2 mins slower than external reliable sources). However, the time being wrong really bugs ...
3
votes
2answers
4k views

Domain Controller time is 7 minutes fast

I have a Server 2008 R2 domain controller running in VM on Hyper-V that is 7 minutes fast which I need to fix. I understand that this maybe down to the DC running in VM's. What I would like to know ...
0
votes
1answer
218 views

NTP / SNTP and UTC Time

I'm trying to get a little bit smarter about the NTP & SNTP protocols. I have read through the RFC's and understand how the protocol works, but I'm uncertain about the timestamps themselves. The ...
27
votes
12answers
8k views

Is anyone using GPS for time sync?

I've come across a handful of GPS NTP servers, as well as some inexpensive solutions using off-the-shelf receivers and software. Right now I'm just using NTP with a list of servers over the Internet. ...
2
votes
5answers
593 views

Accurate DateTime synchronization for Workstations?

How do I synchronize and ensure that the workstations have accurate DateTime synchronized when needed? We have to change workstation date-time for testing some apps. How do I ensure back original ...
6
votes
7answers
12k views

Hyper-V Machine drifts time all over, even with NTP

Resolved The problem was Hyper-V on that machine. I removed Hyper-V, installed VMware Server, ran the same VM. Time sync issues went away (< 100ms difference after a day). My setup is like this: ...
9
votes
9answers
5k views

Time drift

How do you deal with server time drift?
31
votes
4answers
14k views

Windows Server unable to synchronize NTP time reliably

Why does Windows Server (2008, in this case, but I've seen the same problem in 2003) seem to have problem synchronizing time? I've seen this error in my System log across a variety of servers: The ...