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Windows Server 2008 R2 Thread, DC Time Issue in Technical; Hi Everyone On one of my DC's im getting an event log warnings around 19:30 every evening saying "The time ...
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    DC Time Issue

    Hi Everyone

    On one of my DC's im getting an event log warnings around 19:30 every evening saying "The time service has stopped advertising as a time source because the local clock is not synchronized." followed by:

    "The time service detected a time difference of greater than 5000 milliseconds for 900 seconds. The time difference might be caused by synchronization with low-accuracy time sources or by suboptimal network conditions. The time service is no longer synchronized and cannot provide the time to other clients or update the system clock. When a valid time stamp is received from a time service provider, the time service will correct itself"

    Its only happening on DC02 as DC1 and DC3 are ok.

    Has anyone come accross this before? DCs 2 and 3 are VMs so not sure if this is part of the problem.

    Many Thanks

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    glennda's Avatar
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    try running Net time /set and then see if it still does it after a while.

    Physical or Virtual??

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    Michael's Avatar
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    In Windows domains, there cannot be more than 5 minutes difference between all servers and between a server and a workstation.

    If the time is more than 5 mins out, it can create replication problems as well as the unavailability of services. Ideally your primary server (typically the FSMO holder) should sync to a reliable time source (externally), then your other servers and workstations should sync with your primary server.

    This is what you should run on 2008 R2 from an elevated command prompt:

    Code:
    @echo off
    
    net stop w32time
    
    w32tm /config /syncfromflags:manual /manualpeerlist:ntp.bgfl.org
    
    w32tm /config /reliable:yes
    
    net start w32time
    
    w32tm /query /peers
    
    PAUSE

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    Michael's Avatar
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    If the problems continue (despite using a reliable time source), I'd recommend changing the battery on the motherboard.

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    Glenda, DC2 is virtual where the problem is occuring. DC1 is Physical

    Michael, should i run the command on the problem DC?

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    glennda's Avatar
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    Run the commands on the physical DC and then the virtual dc's should sync to them - use Net time /set on the virtual one.

    What virtulisation platform are you using?

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    It's safe to run it on all DCs, but typically you'd run it on your FSMO role holder.

    I forgot to mention, change the NTP.BGFL.ORG bit to an alternative time source. That time server's only for Birmingham schools. Use POOL.NTP.ORG for example.

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    Quote Originally Posted by glennda View Post
    Run the commands on the physical DC and then the virtual dc's should sync to them - use Net time /set on the virtual one.

    What virtulisation platform are you using?
    VMware

    Ive ran the command on DC2 so i will check tomorrow to see if it throws up any more warnings. DC1 was already syncing with ntp.swgfl.org.uk
    Last edited by techie08; 1st May 2012 at 08:17 PM.

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    Ive now noticed that im Getting the follow Kernel Gerneral logs saying:

    The system time has changed to ‎2012‎-‎05‎-‎01T19:37:40.646000000Z from ‎2012‎-‎05‎-‎01T19:37:40.646062500Z.

    The time is an hour behind!!!!

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    Michael's Avatar
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    Check the Time Zone is correct, or as I said above, it could well be the onboard battery powering the BIOS chip.

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    glennda's Avatar
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    Vmware and dcs for time are a bit dodgy - in Vmware you need to set the host to point to the same online ntp server as the dc

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