Date and Time Sync at boot for Active Directory/Open Directory Authenticati

All the macs in my school district are set to automatically sync their time with a network time server. They do not do this unless the system preference is opened. This poses a problem as all our users must authenticate against an Active Directory and an Open Directory server. If the time is out of sync they can not login, and therefore can not fix the time. I must then login in with a local admin account set the time and then the network account can login. I have tried using direct IP addresses for the NTP server. That doesn't work either. I have adjusted the tolerance of the AD server to accept a large discrepancy in time (did not work). Set the users to be mobile accounst (local home folders), did not work. The only fix will be to ensure that the time does sync at boot, before login. Is there a way to force the computer to sync at boot to a given NTP server, prior to the login window appearing?

I have come up with my own solution for this issue. It is a two part solution. We found that the computers are experiencing time drift and that after they get out of sync by 5 minutes they can no longer login. One would think that the setting in the Date and Time system preference to automatically synchronize the time would take care of this. That however is not the case that check mark does not affect the ntp service at all. It merely eliminates the need to click a button when entering the system preference. How did we discover this? well that is part of the solution. We used webmin (http://www.webmin.com) to look at the ntp configuration. No matter what changes we made with the Date & Time preferences nothing changed in the system ntp settings. So on to the solution: Install webmin, and configure the ntp protocol manually to sync at your desired interval (I did hourly). This stops time drift. Next create a startup item and associated plist to force time sync at boot (be sure to loop it as different machines initialize their network cards slower). I have made ours available for download (http://www.manheimcentral.org/~getzt/netTime.zip). I hope this helps others. We have found that this works fairly well.

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I'm not a complete vegetable when it comes to the MAC but my iMAC's problem has me mashed...
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{quote:title=JohniBook wrote:}
Has anyone else encountered it or know of a way to avoid it?
{quote}
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