Some computers that are joined to a domain are configured to synchronize from a manual time source. Use the following procedure to configure a client computer that is currently synchronizing with a manually specified computer, to automatically synchronize time with the domain hierarchy.
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| For more information about the w32tm command, type w32tm /? at a command prompt or see Windows Time Service Tools and Settings on the Microsoft Web site (http://go.microsoft.com/fwlink/?LinkId=42984). |
Administrative Credentials
To perform this procedure, you must be a member of the Administrators group on the local computer. To perform this procedure from a remote computer, you must be a member of the Domain Admins group.
To configure a client computer for automatic domain time synchronization
- Open a Command Prompt.
- Type the following command and then press ENTER:w32tm /config /syncfromflags:domhier /update
- Type the following command and then press ENTER:net stop w32time
- Type the following command and then press ENTER:net start w32time
Administrative Credentials
To perform this procedure locally on the PDC emulator, you must be a member of the Administrators group. To perform this procedure from a remote computer, you must be a member of the Domain Admins group.
To configure the Windows Time service on the PDC emulator
- Open a Command Prompt.
- Type the following command to display the time difference between the local computer and a target computer, and then press ENTER:
w32tm /stripchart /computer:target /samples:n/dataonly
Value Definition target Specifies the DNS name or IP address of the NTP server that you are comparing the local computer’s time against, such as time.windows.com. n Specifies the number of time samples that will be returned from the target computer to test basic NTP communication. - Open UDP port 123 for outgoing traffic if needed.
- Open UDP port 123 (or a different port you have selected) for incoming NTP traffic.
- Type the following command to configure the PDC emulator and then press ENTER:
w32tm /config /manualpeerlist:peers /syncfromflags:manual /reliable:yes /update
where peers specifies the list of DNS names and/or IP addresses of the NTP time source that the PDC emulator synchronizes from. For example, you can specify time.windows.com. When specifying multiple peers, use a space as the delimiter and enclose them in quotation marks.
- w32tm /config /manualpeerlist:time.windows.com /syncfromflags:manual /reliable:yes /update