# Event ID : 1 in windows Server 2012 **URL:** \ **Category:** Uncategorized\ **Created:** [October 13, 2020, 6:19am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806 "2020-10-13T06:19:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![gobinath1984](https://avatars.discourse-cdn.com/v4/letter/g/ce73a5/32.png) [@gobinath1984](https://community.ntppool.org/u/gobinath1984)\ **Post date:** [October 13, 2020, 6:19am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/1 "2020-10-13T06:19:33Z")
Dear Team, I’m having the query about Event ID : 1 , We are having the DC and this DC configured NTP service with **[asia.pool.ntp.org](http://asia.pool.ntp.org)** , some times getting this event **The system time has changed to ‎2020‎-‎10‎-‎10T05:37:50.761128100Z from ‎2020‎-‎10‎-‎10T05:36:29.828443500Z.** **Change Reason: An application or system component changed the time.** But actual time was 10/10/2020 11:07:50 AM . The server BIOS time zone ‎2020‎-‎10‎-‎10T05:37:50.761128100Z ( +0:00 –Greenwich Mean Time ). Windows Server time zone (UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi . My queries are given below, 1. May i know the root cause of this event with above scenario ? 2. If this condition what impact will happen for DC clients ? 3. How to sync windows time with BIOS ? 4. If BIOS & Windows times are differ what impact will happen ? Requesting you to kindly share your input for above concern quires . Regards, Gobinath G ---
**Author:** ![studentmain](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/studentmain/32/354_2.png) [@studentmain](https://community.ntppool.org/u/studentmain)\ **Post date:** [October 14, 2020, 3:34pm UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/2 "2020-10-14T15:34:06Z")
1. It’s a normal log when your system try to modify time to sync with ntppool (or other ntp server) 2. Client will sync with DC 3. 11:07-05:37=05:30, so it’s already synced. 4. Windows will use BIOS time when booting, when OS time is modified, Windows write modified time to BIOS. ---
**Author:** ![gobinath1984](https://avatars.discourse-cdn.com/v4/letter/g/ce73a5/32.png) [@gobinath1984](https://community.ntppool.org/u/gobinath1984)\ **Post date:** [November 2, 2020, 6:29am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/3 "2020-11-02T06:29:52Z")
Dear Team, I have a query , for testing purpose we shutdown the internal NTP server , after a day each client showing with different times. May i know why it’s shows like that . If time server communication dropped it should be continue with last synced time or it from take which source ? ---
**Author:** ![NTPman](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/ntpman/32/450_2.png) [@NTPman](https://community.ntppool.org/u/NTPman)\ **Post date:** [November 2, 2020, 7:17am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/4 "2020-11-02T07:17:09Z")
> [@gobinath1984](#): > > after a day each client showing with different times How much time difference do the clients have to each other? ---
**Author:** ![gobinath1984](https://avatars.discourse-cdn.com/v4/letter/g/ce73a5/32.png) [@gobinath1984](https://community.ntppool.org/u/gobinath1984)\ **Post date:** [November 3, 2020, 5:03am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/5 "2020-11-03T05:03:47Z")
minimum 4 seconds , maximum 1 min. ---
**Author:** ![NTPman](https://sea2.discourse-cdn.com/flex016/user_avatar/community.ntppool.org/ntpman/32/450_2.png) [@NTPman](https://community.ntppool.org/u/NTPman)\ **Post date:** [November 3, 2020, 7:22am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/6 "2020-11-03T07:22:37Z")
When you shutdown your internal NTP sever, the clients has no time source any more. So their clocks are free running, that explains the time drift. ---
**Author:** ![gobinath1984](https://avatars.discourse-cdn.com/v4/letter/g/ce73a5/32.png) [@gobinath1984](https://community.ntppool.org/u/gobinath1984)\ **Post date:** [November 3, 2020, 11:04am UTC](https://community.ntppool.org/t/event-id-1-in-windows-server-2012/1806/7 "2020-11-03T11:04:29Z")
okay , noted … And i have following three queries , kindly guide me . 1. is can not control the clock free running , while NTP server down ? 2. How to monitoring the NTP server which is pointed to internet ? 3. How to monitoring the NTP server which is pointed to intranet ?