Some W32Time-related registry settings are not updated after you upgrade Windows XP Service Pack 2 to Windows Vista or to Windows Vista Service Pack 1

Some W32Time-related registry settings are not updated after you upgrade Windows XP Service Pack 2 to Windows Vista or to Windows Vista Service Pack 1

Article ID : 952660
Last Review : May 16, 2008
Revision : 1.0

SYMPTOMS

You upgrade Windows XP Service Pack 2 (SP2) to Windows Vista or to Windows Vista Service Pack 1 (SP1). However, the following Windows Time Synchronization service (W32Time)-related registry settings are not updated to the default Windows Vista values.

Default registry settings in Windows XP

Registry location Value name Value type and data
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time Config LargePhaseOffset dword:00138800 (Decimal:1280000)
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time Config SpikeWatchPeriod dword:0000005a (Decimal:90)
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time TimeProviders NtpClient EventLogFlags dword:00000000 (Decimal:0)
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time TimeProviders NtpServer Enabled dword:00000001 (Decimal:1)

Default registry settings in Windows Vista

Registry location Value name Value type and data
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time Config LargePhaseOffset dword:02faf080 (Decimal:50000000)
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time Config SpikeWatchPeriod dword:00000384 (Decimal:900)
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time TimeProviders NtpClient EventLogFlags dword:00000001 (Decimal:1)
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time TimeProviders NtpServer Enabled dword:00000000 (Decimal:0)

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WORKAROUND

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

322756 (/Feedback.aspx?kbNumber=322756/) How to back up and restore the registry in Windows

To manually change these settings to the default Windows Vista values, follow these steps:

1. Click Start, type regedit in the Start Search box, and then click regedit in the Programs list. If you are prompted for an administrator password or for confirmation, type the password, or click Continue.
2. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time Config
3. Right-click LargePhaseOffset, and then click Modify.
4. In the Value data box, type 02faf080, and then click OK.
5. Right-click SpikeWatchPeriod, and then click Modify.
6. In the Value data box, type 00000384, and then click OK.
7. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time TimeProviders NtpClient
8. Right-click EventLogFlags, and then click Modify.
9. In the Value data box, type 1, and then click OK.
10. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services W32Time TimeProviders NtpServer
11. Right-click Enabled, and then click Modify.
12. In the Value data box, type 0, and then click OK.
13. Exit Registry Editor, and then restart the computer.

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the Applies to section.

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MORE INFORMATION

Value name Description
LargePhaseOffset Specifies the time offset, in tenths of a microsecond (A tenth of a microsecond is equal to 10 to the power of -7). Times that are larger than or equal to this value are considered suspicious and possibly incorrect.
SpikeWatchPeriod Specifies how long, in seconds, that a suspicious time offset must persist before it is accepted as correct.
EventLogFlags Stores configuration data for the policy setting, Configure Windows NTP Client.
Enabled Indicates whether the NtpServer provider is enabled in the current Time Service.

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APPLIES TO
• Windows Vista Service Pack 1, when used with:
    Windows Vista Enterprise 64-bit Edition
    Windows Vista Home Basic 64-bit Edition
    Windows Vista Home Premium 64-bit Edition
    Windows Vista Ultimate 64-bit Edition
    Windows Vista Business
    Windows Vista Business 64-bit Edition
    Windows Vista Enterprise
    Windows Vista Home Basic
    Windows Vista Home Premium
    Windows Vista Starter
    Windows Vista Ultimate

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Keywords: 
kbtshoot kbexpertisebeginner kbprb KB952660

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Microsoft Knowledge Base Article

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