Event ID 135 — Manual Time Source Acquisition

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Applies To: Windows Server 2008

An Active Directory forest has a predetermined time synchronization hierarchy. The Windows Time service (W32time) synchronizes time between computers within the hierarchy, with the most accurate reference clocks at the top. If more than one time source is configured on a computer, Windows Time uses Network Time Protocol (NTP) algorithms to select the best time source from the configured sources, based on the computer’s ability to synchronize with that time source. The Windows Time service acquires a time source peer from the domain heirarchy. By default, computers running the Windows Time service attempt to synchronize time only with a domain controller or a manually configured time source. Currently, the Windows Time service is synchronizing with a manually configured time source peer (as opposed to a time source peer from the domain hierarchy).

Event Details

Product: Windows Operating System
ID: 135
Source: Microsoft-Windows-Time-Service
Version: 6.0
Symbolic Name: MSG_MANUAL_PEER_DUPLICATE_ERROR
Message: NtpClient was unable to set a manual peer to use as a time source because of duplicate error on '%3'. The same time source '%4' has been either specified as manual peer in NtpServer or selected as domain peer. NtpClient will try again in %2 minutes and double the reattempt interval thereafter. The error was: %1

Resolve

Configure an appropriate time source partner

The local Windows Time service is attempting to synchronize from a time source peer that is configured to synchronize from the local Windows Time service. You cannot have two computers running Windows Time service configured to synchronize from each other. To resolve this issue, configure the local Windows Time service to use a different time source peer or modify the configuration of the current time source peer to use a different time source peer. Perform the following procedure on the computer that is logging the event to be resolved.

To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To configure a manual time source peer:

  1. Open a command prompt as an administrator. To open a command prompt as an administrator, click Start. In Start Search, type Command Prompt. At the top of the Start menu, right-click Command Prompt, and then click Run as administrator. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  2. At the command prompt, type **w32tm /config /manualpeerlist:server,0x8, /syncfromflags:manual /update, where server is the name of the time source that you want to configure, and then press ENTER.

To learn more about the Windows Time service and related tools, see Windows Time Service Tools and Settings (https://go.microsoft.com/fwlink/?LinkID=42984).

Verify

To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To verify that the Windows Time service is synchronizing correctly:

  1. Open a command prompt as an administrator. To open a command prompt as an administrator, click Start. In Start Search, type Command Prompt. At the top of the Start menu, right-click Command Prompt, and then click Run as administrator. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  2. At the command prompt, type W32TM /resync, and then press ENTER.
  3. At the command prompt, type W32TM /query /status, and then press ENTER. This command displays the status of the Windows Time service synchornization. The Last Successful Sync Time line of the output displays the date and time that you ran the W32TM /resync command in the previous step. Also, check the computer name that is shown as the Source. This should be the name of a domain controller (or administrator-configured time server).

To confirm that the Windows Time service synchronized successfully with a time source peer, verify that Event ID 37 appears in Event Viewer. If there was a recovery from a previous failure to synchronize with the time source, you also see Event ID 137, which indicates that the Windows Time service is synchronized correctly.

For more information about the Windows Time service, see Windows Time Service Technical Reference (https://go.microsoft.com/fwlink/?LinkID=25393).

Manual Time Source Acquisition

Active Directory