nikolas.e
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Registered:1451844054 Posts: 154
Posted 1496148232
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#1
i remember i have asked this question old times but since i cant look to old posts (New Forum) i will have to ask again When a DC holding the PDC role (One Domain in the forest) syncs its time with a NTP Server, The Time that it is been synced between the DC and NTP is the UTC time correct? Windows O/S only handles the Time zone that is selected on the system and displayed to us. Can anyone verify that this info is correct? Thank you I will add an example UTC Time 1:00 PM Athens Time Zone : UTC+2:00 Domain controller display time based on UTC sync and Timezone should be 3:00 PM
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DM-AVAL
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Registered:1452043080 Posts: 79
Posted 1496158882
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#2
From what I understand, that is correct. Domain controllers use UTC but local time is what is displayed to the user based on regional settings. Use of UTC is necessary since many organizations span time zones.
cspanburgh
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Registered:1451586584 Posts: 229
Posted 1496160199
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#3
Good to know. thanks. We need to build up answers here.
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nikolas.e
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Registered:1451844054 Posts: 154
Posted 1496312241
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#4
Quote:
Originally Posted by DM-AVAL From what I understand, that is correct. Domain controllers use UTC but local time is what is displayed to the user based on regional settings. Use of UTC is necessary since many organizations span time zones.
Thank you for your answer.
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Pieter
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Registered:1455526466 Posts: 191
Posted 1496735797
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#5
FYI. I recently had a problem with the external NTP server we use. The NTP server was suddenly 1 day ahead. While I was throubleshooting it, I found two interesting registry keys : HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Config\MaxPosPhaseCorrection and MaxNegPhaseCorrection If set to 300 (decimal in seconds, that's 5 min) the NTP client (the PDCe) will not sync with the NTP server if that server is more than 5 minutes ahead of or behind previous time. If the time jump is more that 5 minutes, we can presume that the NTP server has a problem and the NTP client shouldn't sync.
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nikolas.e
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Registered:1451844054 Posts: 154
Posted 1496738145
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#6
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Originally Posted by Pieter FYI. I recently had a problem with the external NTP server we use. The NTP server was suddenly 1 day ahead. While I was throubleshooting it, I found two interesting registry keys : HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Config\MaxPosPhaseCorrection and MaxNegPhaseCorrection If set to 300 (decimal in seconds, that's 5 min) the NTP client (the PDCe) will not sync with the NTP server if that server is more than 5 minutes ahead of or behind previous time. If the time jump is more that 5 minutes, we can presume that the NTP server has a problem and the NTP client shouldn't sync.
Pieter so your forest root domain PDC received incorrect time from the NTP Server and every system in your network synced hierarchy the wrong time? What was your first steps to resolve this? Switch to different NTP Server?
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Pieter
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Posted 1496740526
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#7
>> What was your first steps to resolve this? Switch to different NTP Server? Yes, well I changed the NTP server to a non-existing NTP source (made a typo) and corrected the time on the PDCe manually. Then stop/start Time server and "w32tm /resync" on the DC's and afterwards on the member servers.
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