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mtarabayFlag for United States of America

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Domain Controller Time

I have a domain that carried throuth two domain controllers machines. these two machines act also as NTP local servers.
My problem is :
i have time shift 14 minuits exceded of normal time , So all computer in domain have the same time shift.
is there a procedure to correct time into these two machines for correction the domain time without any drop into domain services or Exchange 2010 servers?
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Perarduaadastra
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Where are these two servers getting their time from?
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ASKER

Time from internal OS time zone adjustment.
ASKER CERTIFIED SOLUTION
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snusgubben
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I agree with snusgubben that an external time source is the way to go.
I've come across quite noticeable time drift in situations where computer hardware clocks are used as the source for domain time, and changing to a reliable external source has always made the problem go away.
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I don't know if you fix the time that Kerberos will break. It has a nominal tolerance of 5 minutes. To be safe you can correct the time by 4 minutes per day on the DPC emulator. Once you are within 5 minutes of the correct time you can set the PDC emulator to use an external time source.  
I would use a internet npt server like pool.ntp.com in you servers so the servers get the correct time as ntp servers are based on atomic clocks and are like a atomic radio clock
Thanks snusgubben, it is working properly without any problem effects to domain or exchange servers.