Set pdc to use external time source windows#

Set pdc to use external time source windows#

In a domain, time synchronization takes place when Windows Time Service turns on during system startup and periodically while the system is running.In the default configuration, the Net Logon service looks for a Domain Controller that can authenticate and synchronize time with the client. Therefore it is needed to open the UDP port 123 for NTP on all machines. It uses itвЂ™s own BIOS time but should be changed to another time source like a NTP hardware device, routers, layer3 switches or external time servers, that are able to act as a time provider.ДЄll other Domain Controllers synchronize with this machine and all domain member servers and domain workstations synchronize with one available DC. One Domain Controller, the DC with the PDC Emulator FSMO (Flexible Single Master Operations) role, is the time master in the domain. You will not realize the UTC time itself, as the time zone information whichВ is stored in the computerвЂ™s registry, is added to the system time just before it is displayed to the user. UTC is independent of time zones and enables NTP to be used anywhere in the world regardless of time zone settings.

The support boundaries are listed here.ДЄlso important to know is,В that Domain Controllers use with NTPВ the UTC (Coordinated Universal Time), as this isВ the universal standard for current time. If you have the need for high accurate time, you have to use a вЂњStratum OneвЂќ device, which is capable of this. See High Accuracy W32time Requirements for details. One important information to have is, that the Windows Time Service is NOT built to be a high accuracy NTP solution going down to 1-2 seconds. It has to be as close as possible for all domain machines, which is realized with the setup of the hierarchy how the domain time is prepared.

If you need more accurate time however, you can purchase a hardware time source like an atomic clock and connect it to your PDC emulator.In a domain one of the most important settings is the time. Depending on the latency of your Internet connection, the accuracy of the CMOS clock on your forest root PDC Emulator may be within a second or two of UTC. It may take an hour or so for the PDC Emulator to fully synchronize with the external time server because of the nature of the polling method W32Time uses. Now stop and restart the Windows Time service using the following commands: Alternatively, you can specify the IP address of this time server, which is 192.5.41.209 instead. For example, to synchronize the PDC Emulator in your forest root domain with, an open-access SNTP time server run by the United States Naval Observatory, change the value of the NtpServer registry entry from ,0x1 to ,0x1 here. The list may consist of one or more DNS names or IP addresses (if DNS names are used then you must append ,0x1 to the end of each DNS name). This registry entry specifies a space-delimited list of stratum 1 time servers from which the local computer can obtain reliable time stamps.

HKLMSYSTEMCurrentControlSetServicesW32TimeParametersNtpServer.

Change this REG_DWORD value from 10 to 5 here. This registry entry controls whether the local computer is marked as a reliable time server (which is only possible if the previous registry entry is set to NTP as described above).

HKLMSYSTEMCurrentControlSetServicesW32TimeConfigAnnounceFlags.

Change this REG_SZ value from NT5DS to NTP so the PDC Emulator synchronizes from the list of reliable time servers specified in the NtpServer registry entry described below. This registry entry determines which peers W32Time will accept synchronization from.

HKLMSYSTEMCurrentControlSetServicesW32TimeParametersType.

Open Registry Editor (regedit.exe) and configure the following registry entries: The procedure for doing this on a PDC Emulator running Windows Server 2003 in the forest root domain is as follows. This is a good idea if your company is a large enterprise with sites spanning several countries, or if your organization has two or more forests linked by forest trusts. To ensure that the clocks on your machines are more accurate in terms of absolute (and not just relative) time, you can sync the PDC Emulator in your forest root domain to one of the reliable time servers available on the Internet. Below are instructions to ensure the responsible server is always synchronized with a reliable source. The problem arises when the serverВ isnвЂ™tВ keeping the time accurately thus affecting the workstation times. Most organizations setup their workstations to synchronize their time with their domain controller.