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31
votes
4answers
15k 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 ...
28
votes
12answers
9k 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. ...
14
votes
8answers
23k views

How do I update a CentOS server's time from an authoritative time server?

I have CentOS machine and each time I've noticed that the server loses correct time after a while. It is usually behind by several minutes after time passes from having manually set the correct time. ...
13
votes
2answers
534 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 ...
10
votes
3answers
2k views

Timesync on HyperV with CentOS 6.2

I've got a CentOS VM (release 6.2) running under HyperV. I have integration services installed (part of base now), and CentOS shows the current clocksource is hyperv_clocksource, however my time in ...
9
votes
9answers
5k views

Time drift

How do you deal with server time drift?
8
votes
4answers
16k 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 ...
7
votes
6answers
660 views

What consequences / implications can arise from a wrong system clock?

What issues can you think of that may arise from a wrong system clock setting ? Primarily interested in potential problems affecting servers and Linux or UNIX-like systems in particular. And how ...
7
votes
7answers
13k 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: ...
6
votes
2answers
440 views

how to auto-run ntdpdate command?

I have a few dedicated servers and for some reason they are totally unable to mantain the time properly synchronized, every few days they start having differences of minutes in the clock. So I have to ...
6
votes
3answers
12k 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 ...
5
votes
4answers
39k views

How to synchronize the clock of a windows server 2003 domain server?

Given a windows server 2003 domain server, I'd like to sync it's time to (any) external time services (it's off a couple of minutes). How to do this 1, manually; 2, in an automated manner every week?
5
votes
1answer
19k views

Can't access some clients using w32tm /stripchart - error: 0x800705B4

I'm trying to track down a time synchronisation problem. I've got a DC in a remote branch. w32tm /dumpreg /subkey:Parameters reveals Type = NT5DS and the Type means its sync'ing with the domain, I ...
5
votes
1answer
922 views

Why won't my domain server (2008 R2) sync with external time service correctly?

I have configured my PDC (windows 2008 R2) to sync with external time source uk.pool.ntp.org and followed all the instructions to the letter which are set out here: ...
4
votes
2answers
3k 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 ...
4
votes
3answers
1k views

Best way to synchronise the time on a Windows 2008 Server

I have a small Windows domain (all servers running Windows 2008), with a single Windows 2008 Domain Controller. What is the best way to synchronise the time across all servers with an Internet Time ...
4
votes
1answer
2k views

How do I re-enable the VM IC Time Synchronization Provider for a Hyper-V client?

We have a Windows domain network with 2 Hyper-V hosts. On these hosts, there are several Hyper-V VM clients. Two of these clients are Domain Controllers. The Hyper-V hosts are both clients of that ...
4
votes
2answers
3k views

How to keep time on resumed KVM guest with libvirt?

On my host I am using libvirt and a KVM guest. When the host is shutting down, libvirt suspends the guest. When the host is starting up, libvirt resumes the guest. The problem is, if the guest is ...
4
votes
1answer
407 views

Why is the time on my Server 2008 R2 DC wrong? It's syncing to ntp.org, it claims

OK. After a lot of fun with syncing time across my workstations, I got that sorted out. My workstations are now perfectly synced with my Server 2008 R2 Domain Controller (physical server, not ...
3
votes
2answers
5k 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 ...
3
votes
2answers
841 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 ...
3
votes
2answers
613 views

How to synchronize windows server date/time?

I administer multiple Windows servers. One issue I have is that the time gets out of sync, and this becomes noticeable over a week or so. For example, my app server system time could be different ...
3
votes
2answers
141 views

Reliable Time Protocol Server Online?

I have some OLD legacy hardware that I'd like to keep time synchronized on. It supports the TIME protocol (not NTP). Are there any reliable TIME servers online anymore? If so, where? -M
3
votes
1answer
282 views

How to disable time synchronization on hyper V

I have test machine on hyper v (only for test purposes so I can do with it whatever I want to), it is ws 2008 r2 x64. I need to change date to 2008 year in order to test some scenarios with expired ...
3
votes
2answers
638 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 ...
3
votes
1answer
1k views

Correct time drift throughout entire Windows domain

I have done a lot of research but failed to find a reliable answer to our problem. The short story is our entire Windows domain is running 35 minutes slow. I.e. servers and workstations. I think ...
3
votes
2answers
423 views

ntpdate ignores my timezone

I'm trying to set up time sync on a CentOS 5.5 VDS but can't figure out why it won't update to the correct timezone. e.g. After manually setting the correct date and time when I run this: date ...
3
votes
1answer
14k views

How can I check if my time sync is correct?

I have updated a W2K3 settings according to the steps shown here: http://support.microsoft.com/kb/816042#LetMeFixItMyselfAlways2 The peers list I use is: 0.asia.pool.ntp.org,0x1 ...
3
votes
1answer
121 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 ...
3
votes
1answer
2k views

Amazon EC2 instances changes server time/date on reboots and other time weirdness

I have a windows instance up in EC2. I manually set the timezone to Pacific. 1) For some reason using window's built in time sync doesn't work in the instance...but whatever. I turn off automatic ...
2
votes
4answers
382 views

Anybody tried to use graphic card as a precision clock on a Windows server?

I am thinking (constantly) how to make my server be synchronised better than it is. I run some cheap app which syncs me with some stratum 2 server on the colo and drift is about 1-2 ms per 10 sec ...
2
votes
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?
2
votes
2answers
382 views

Windows Time Service OS Compatibility

Some of our servers have Domain Time II on them but we are having to make the possible decision to buy over 100+ licenses for Domain Time II or enable the windows time service. The installation of ...
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
2answers
272 views

Configuring time sync on domain

I have an AD domain (2 dcs single domain) and a number of member servers. I need to configure time synchronisation so that everything is in sync. There is a lot of fluff on this topic. Does anyone ...
2
votes
3answers
2k views

How can I syncronize a non-domain server to a domain-controller's clock?

Is it possible to configure a Windows Server 2000 OS to synchronize it's clock to a domain controller if it's not on the domain? If so, how would I go about doing that? Just to be clear: I can't ...
2
votes
5answers
599 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 ...
2
votes
2answers
348 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 ...
2
votes
2answers
4k views

Windows Server 2012 DC loses time sync after reboot/dcpromo

I'm currently experiencing an issue that has baffled me for the past few days as none of my searches here or google yielded in any positive results. Our current environment has 19 sites with as many ...
2
votes
3answers
18k views

Config Time Service on Server 2008 DC using Group Policy Only

I want to configure the Time Service using only GP in a Server 2008 R2 domain. I have created a GP as follows: Computer Config, Policies, Administrative Templates, System, Windows Time Policy: ...
2
votes
3answers
4k 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 ...
2
votes
2answers
7k 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 ...
2
votes
3answers
298 views

Why doesn't the time match on two Windows Domain Controllers despite resync?

In my domain there are two domain controllers, there is a gap of 3 minutes between their times and than I can find this difference between many clients (it depends on their DC). If I run this ...
2
votes
3answers
468 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 ...
2
votes
1answer
119 views

Domain Time Issue

I have 2 DC's. One is virtual, one is physical. The time on my domain is running fast. I suspect this is due to one of the DC's being virtual. How can I set the domain to use the physical DC as the ...
2
votes
3answers
5k views

Windows Time out of sync

We have 5 virtual Windows 2003 servers running Citrix in our company, that users can log onto, Every so often one of the servers will change it's date/time so far ahead, users are unable to log on ...
2
votes
2answers
855 views

vmware esxi wrong time after vmotion

After vMotion some guests went 2 hours ahead in time. 2 hours ahead of UTC is exactly our timezone. Why would it do that? AFAICS both source and destination hosts have the same configuration. But ...
2
votes
1answer
749 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
2answers
270 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. ...
2
votes
1answer
13k 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 ...