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Windows Server 2008 R2 Thread, AD time is 1 hour behind this morning - what will break when I fix it? in Technical; Originally Posted by AngryTechnician which is clearly Not Right. So it looks like external time sync has failed on the ...
  1. #16

    glennda's Avatar
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    Quote Originally Posted by AngryTechnician View Post
    which is clearly Not Right. So it looks like external time sync has failed on the FSMO. The question is why it then fell back to an incorrect time. This server is a VM, but without the time sync integration, where would the CMOS time come from?
    Will it not fall back to the time set in the bios? or just generally work its way out of sync slowly (vm's tend not to be great sometimes with the time

  2. #17

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    I think it must have been slowly working it's way out of sync since the internet time server stopped working. Over a long weekend while I wasn't monitoring it I could easily see it build up an hour. Will monitor the exact delta over the rest of the day and see if it creeps any more.

  3. #18

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    CMOS isnt reliable my servers were doing wierd things when it looked at CMOS so just point to uk.ntp servers then send resync command to clients

  4. #19

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    Sorry, I understood that Sync is disabled, but the Virtual BIOS has to get the initial time (during its 'power-on') from somewhere. In this case the initial seed from the host has the correct time settings, so either way can't be the root of the problem.

    Just out of interest is it exactly or 'about' one hour out? <<-nevermind, answered already!

    VMs cannot hold time. this is why they must sync with an external source, and why the Time Sync Service exisits, however as you have done, Best practice for domain environments is to disable that and use NTP instead. If connection to NTP is lost then the PDC emulator falls back to 'clock ticks' which are generally fine when running on bare metal, but utterly unreliable inside a Virtualised environment.

    VMWare based but the prinicples hold: http://www.vmware.com/files/pdf/Time...alMachines.pdf
    Last edited by psydii; 3rd May 2011 at 12:25 PM. Reason: too slow, question answered already.

  5. Thanks to psydii from:

    AngryTechnician (3rd May 2011)

  6. #20

    AngryTechnician's Avatar
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    Right now it is behind by 52 minutes and 25 seconds, using BST: British Summer Time: UK Daylight Saving Time (GMT +1) as the current time source.

  7. #21

    glennda's Avatar
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    If you are part of an LEA you may find that some external times sources are blocked. I know that I have to use our LEA's timeserver as we cannot get out on port 123(i think its that)

  8. #22

    AngryTechnician's Avatar
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    We're independent, our Internet connection is a raw VDSL feed from Zen. Port 123 is not blocked on our router.

  9. #23
    chazzy2501's Avatar
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    you could buy one of these (Always wanted one)

    Rackmount GPS NTP Server | NTS-4000-GPS-R | Galleon Systems Ltd.

  10. #24

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    Only $1500! BARGAIN!

    Now I think about it, I wonder why all our phones that have GPS built in can't sync time from it? My Android can only sync from NTP or the mobile network, but the data is clearly available because I can see it in the GPS Essentials app.

  11. #25

    teejay's Avatar
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    Use uk.pool.ntp.org rather than europe.pool.ntp.org

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    Quote Originally Posted by AngryTechnician View Post
    Only $1500! BARGAIN!

    Now I think about it, I wonder why all our phones that have GPS built in can't sync time from it? My Android can only sync from NTP or the mobile network, but the data is clearly available because I can see it in the GPS Essentials app.
    Hmmm, that sounds an interesting android app project, to make an android phone sync time with GPS and act as an NTP time source for your network. Might have a play with that.

  13. #27

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    Quote Originally Posted by teejay View Post
    Use uk.pool.ntp.org rather than europe.pool.ntp.org
    Simply for improved accuracy? Or is it important that we have British NTP packets?

  14. #28

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    Quote Originally Posted by AngryTechnician View Post
    Simply for improved accuracy? Or is it important that we have British NTP packets?
    Yeah, we don't want any of those dodgy foreign NTP packets, you really don't know where they've been and they'll be taking jobs away from our good honest British NTP packets

    Yes, it's supposed to improve accuracy as you want minimum latency on this.

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    AngryTechnician (3rd May 2011)

  16. #29

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    Quote Originally Posted by teejay View Post
    they'll be taking jobs away from our good honest British NTP packets
    You forgot "hard-working".

  17. #30

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    OK, it seems to be good news so far:

    After reconfiguring the FSMO DC to sync from a different time source, it synced correctly. Logged in to each replica DC via RDP and ran w32tm /resync /rediscover, and they synced correctly with the FSMO DC.

    I then moved on to the other servers, but before I could get to all of them, some had already resynced on their own. Same for some of the workstations I've hit so far. I've also tested a simple reboot and that kicks the time update into effect as well, so if any are being petulant tomorrow morning I can hopefully instruct users to restart them and all will be well.

    Finger crossed for tomorrow morning!

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