PDC sync time with NTP - Mark Minasi's Tech Forum

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nikolas.e

Senior Member
Registered:1451844054
Posts: 102

Posted 1496148232 · Edited	Reply with quote #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 __________________ Just call me the 1000Questionsguy
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DM-AVAL

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Posts: 69

Posted 1496158882	Reply with quote #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.
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cspanburgh

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Registered:1451586584
Posts: 188

Posted 1496160199	Reply with quote #3

Good to know. thanks. We need to build up answers here. __________________ Curt Spanburgh
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nikolas.e

Senior Member
Registered:1451844054
Posts: 102

Posted 1496312241	Reply with quote #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. __________________ Just call me the 1000Questionsguy
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Pieter

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Registered:1455526466
Posts: 130

Posted 1496735797	Reply with quote #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. __________________ Pieter Demeulemeester
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nikolas.e

Senior Member
Registered:1451844054
Posts: 102

Posted 1496738145	Reply with quote #6

Quote: 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? __________________ Just call me the 1000Questionsguy
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Pieter

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Registered:1455526466
Posts: 130

Posted 1496740526	Reply with quote #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. __________________ Pieter Demeulemeester
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