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TimeSync issues between Windows 2008 and Windows 2003R2 domain controllers

Posted on 2009-05-15
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Last Modified: 2012-05-07
Hi,

We are upgrading our domain controllers in our Active Directory Domain.  We have 7 domain controllers : 5 Windows 2003R2 and 2 new Windows 2008 domain controllers.  One of the 2 2008 machines is now our PDC Emulator.  If I run  "w32tm /Monitor" on one of the servers, I get the following results:

C:\Documents and Settings\Administrator.AD>w32tm /monitor
ldapcde.ad.ua.ac.be [143.169.245.24]:
    ICMP: 0ms delay.
    NTP: +72.1835039s offset from LDAP1.ad.ua.ac.be
        RefID: cde254254.cde.ua.ac.be [143.169.254.254]
ldapcst.ad.ua.ac.be [146.175.245.24]:
    ICMP: 1ms delay.
    NTP: +72.1301043s offset from LDAP1.ad.ua.ac.be
        RefID: cde254254.cde.ua.ac.be [143.169.254.254]
xmail01.ad.ua.ac.be [143.169.244.30]:
    ICMP: 0ms delay.
    NTP: +72.1231895s offset from LDAP1.ad.ua.ac.be
        RefID: cde254254.cde.ua.ac.be [143.169.254.254]
xmail02.ad.ua.ac.be [143.169.244.31]:
    ICMP: 0ms delay.
    NTP: +72.1507059s offset from LDAP1.ad.ua.ac.be
        RefID: cde254254.cde.ua.ac.be [143.169.254.254]
xmail05.ad.ua.ac.be [143.169.244.34]:
    ICMP: 0ms delay.
    NTP: +72.1304011s offset from LDAP1.ad.ua.ac.be
        RefID: cde254254.cde.ua.ac.be [143.169.254.254]
LDAP1.ad.ua.ac.be *** PDC *** [143.169.245.67]:
    ICMP: 0ms delay.
    NTP: +0.0000000s offset from LDAP1.ad.ua.ac.be
        RefID: 'LOCL' [76.79.67.76]
LDAP2.ad.ua.ac.be [143.169.245.68]:
    ICMP: 1ms delay.
    NTP: -0.0125596s offset from LDAP1.ad.ua.ac.be
        RefID: LDAP1.ad.ua.ac.be [143.169.245.67]

The 2 new 2008 machines (ldap1 and ldap2) are synchronized and on a 0 second offset.  The 5 older 2003R2 machines (LDAPCDE, LDAPCST, XMAIL01, XMAIL02 and XMAIL05) are synchronized to eachother, but are all on an 72 second offset to the reference server (=one of the new 2008 machines).

At this moment I don't experience any problem in our domain, but it just doesn't feel right (A few years ago we had a similar problem with a Novell eDirectory network, and this resulted in a lot of trouble after a few days...).  I tried to issue a "w32tm /resync"-command on one of the 2003R2-servers, and it completes with the messages "The command completed succesfully.", but the server still remains at the same 72 second offset.

Is there something else needed to sync 2003R2 domain controllers to 2008 domain controllers?

Bertin Peeters
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Question by:sysUA
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Paka earned 250 total points
ID: 24393470
Do you have any manually configured SNTP settings?  Try this on each server:

Open a command prompt and type:
net stop w32time
w32tm /unregister (if you get a permission error - repeat this command)
w32tm /register
net start w32time

On the PDCe, you will have to reconfigure your NTP server.  To do so, use the previous command and follow it up with:
net time /setsntp:YourNTPServer

Try another net stop/start w32time to see if it synced.
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Expert Comment

by:Paka
ID: 24393478
P.S.  With a 72 second offset, you should be seeing authentication and Kerberos errors unless you changed your Kerberos time tolerance.
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Author Closing Comment

by:sysUA
ID: 31581838
Thanks!  Our 5 W2003R machines were synchronizing with an ntp-server 143.169.254.254, while the W2008 were synchronizing locally.  I now changed the whole configuration: the PDC is now synchronizing with the ntp-server, and the other DC's are synchronizing with the PDC.  All time-offsets are now at 0.x seconds.
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