MaxNegPhaseCorrection If a time sample is received that indicates a time in the past as compared to the client computer's local clock that has a time difference that is greater than the MaxNegPhaseCorrection value, the time sample is discarded.
Default: , seconds. MaxPosPhaseCorrection If a time sample is received that indicates a time in the future as compared to the client computer's local clock that has a time difference greater than the MaxPosPhaseCorrection value, the time sample is discarded. PhaseCorrectRate This parameter controls how quickly W32time corrects the client computer's local clock difference to match time samples that are accepted as accurate from the NTP server.
Lower values cause the clock to correct more slowly; larger values cause the clock to correct more quickly. Default: 7 scalar. PollAdjustFactor This parameter controls how quickly W32time changes polling intervals. When responses are considered to be accurate, the polling interval lengthens automatically. When responses are considered to be inaccurate, the polling interval shortens automatically.
Default: 5 scalar. SpikeWatchPeriod This parameter specifies the amount of time that samples with time offset larger than LargePhaseOffset are received before these samples are accepted as accurate. SpikeWatchPeriod is used in conjunction with HoldPeriod to help eliminate sporadic, inaccurate time samples that are returned from a peer.
UpdateInterval This parameter specifies the amount of time that W32time waits between corrections when the clock is being corrected gradually. When it makes a gradual correction, the service adjusts the clock slightly, waits this amount of time, and then checks to see if another adjustment is needed, until the correction is finished.
AnnounceFlags This parameter is a bitmask value that controls how time service availability is advertised through NetLogon. Default: 0x0a hexadecimal. Default: 0x02 hexadecimal bitmask. LocalClockDispersion This parameter indicates the maximum error in seconds that is reported by the NTP server to clients that are requesting a time sample.
Default: 10 seconds. MaxPollInterval This parameter controls the maximum polling interval, which defines the maximum amount of time between polls of a peer.
Default: 10 in log base-2, or seconds. Should not be set higher than MinPollInterval This parameter controls the minimum polling interval that defines the minimum amount of time between polls of a peer. This setting can also be configured in VMWare tools as far as I remember.
If you having trouble to apply the setting to the w32tm configuration, try to edit the local GPO in gpedit. Office Office Exchange Server. Not an IT pro? Resources for IT Professionals. Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. Directory Services. Sign in to vote. The output presents the poll interval in both clock ticks and in seconds. The equations use the value measured in seconds the value in parentheses.
The output presents the clock rate in seconds. To see the SystemClockRate value in clock ticks, use the following formula:. For example, if SystemClockRate is 0. For full descriptions of the configurable parameters and their default values, see Config entries later in this article. The following examples show how to apply these calculations for Windows Server R2 and earlier versions.
In this case, if you want to set the clock back slowly, you would also have to adjust the values of PhaseCorrectRate or UpdateInterval in the registry to make sure that the equation result is TRUE. The Windows Time service stores a number of configuration properties as registry entries. It stores configuration information that the policies define in the Windows registry, and then uses those registry entries to configure the registry entries specific to the Windows Time service.
As a result, the values defined by Group Policy overwrite any pre-existing values in the Windows Time service section of the registry. Some of the preset GPO settings differ from the corresponding default Windows Time service registry entries. Windows loads these settings into the policy area of the registry under the following subkey:.
Then Windows uses the policy settings to configure the related Windows Time service registry entries under the following subkey:. The following table lists the policies that you can configure for the Windows Time service, and the registry subkeys that those policies affect. When you remove a Group Policy setting, Windows removes the corresponding entry from the policy area of the registry.
This information is provided as a reference for use in troubleshooting and validation. Windows registry keys are used by W32Time to store critical information. Don't change these values. Modifications to the registry are not validated by the registry editor or by Windows before they are applied. If the registry contains invalid values, Windows may experience unrecoverable errors. Some of the parameters in the registry are measured in clock ticks and some are measured in seconds.
To convert the time from clock ticks to seconds, use these conversion factors:. Note Zero is not a valid value for the FrequencyCorrectRate registry entry. HoldPeriod All versions Controls the period of time for which spike detection is disabled in order to bring the local clock into synchronization quickly.
A spike is a time sample indicating that time is off a number of seconds, and is usually received after good time samples have been returned consistently. The default value on domain members is 5. The default value on stand-alone clients and servers is 5. LargePhaseOffset All versions Specifies that a time offset greater than or equal to this value in 10 -7 seconds is considered a spike.
A network disruption such as a large amount of traffic might cause a spike. A spike will be ignored unless it persists for a long period of time. The default value on domain members is The default value on stand-alone clients and servers is It contains reserved data that is used by the Windows operating system, and any changes to this setting can cause unpredictable results. MaxAllowedPhaseOffset All versions Specifies the maximum offset in seconds for which W32Time attempts to adjust the computer clock by using the clock rate.
When the offset exceeds this rate, W32Time sets the computer clock directly. The default value for domain members is The default value for stand-alone clients and servers is 1. The default value for stand-alone clients and servers is MaxNegPhaseCorrection All versions Specifies the largest negative time correction, in seconds, that the service makes.
If the service determines that a change larger than this is required, it logs an event instead. This value means that the service always corrects the time. The default value for domain controllers is , 48 hrs. The default value for stand-alone clients and servers is 54, 15 hrs. MaxPollInterval All versions Specifies the largest interval, in log2 seconds, allowed for the system polling interval. Note that while a system must poll according to the scheduled interval, a provider can refuse to produce samples when requested to do so.
The default value for domain controllers is MaxPosPhaseCorrection All versions Specifies the largest positive time correction in seconds that the service makes. MinPollInterval All versions Specifies the smallest interval, in log base 2 seconds, allowed for the system polling interval. Note that while a system does not request samples more frequently than this, a provider can produce samples at times other than the scheduled interval. The default value for domain controllers is 6.
PhaseCorrectRate All versions Controls the rate at which the phase error is corrected. Specifying a small value corrects the phase error quickly, but might cause the clock to become unstable.
If the value is too large, it takes a longer time to correct the phase error. The default value on domain members is 1. The default value on stand-alone clients and servers is 7. Note Zero is not a valid value for the PhaseCorrectRate registry entry. PollAdjustFactor All versions Controls the decision to increase or decrease the poll interval for the system.
The larger the value, the smaller the amount of error that causes the poll interval to be decreased. RequireSecureTimeSyncRequests Windows 8 and later versions Controls whether or not the DC will respond to time sync requests that use older authentication protocols. If enabled set to 1 , the DC will not respond to requests using such protocols. This is a boolean setting, and the default value is 0. SpikeWatchPeriod All versions Specifies the amount of time that a suspicious offset must persist before it is accepted as correct in seconds.
Default: 7 scalar. PollAdjustFactorThis parameter controls how quickly W32time changes polling intervals. When responses are considered to be accurate the polling interval lengthens automatically. When responses are considered to be inaccurate the polling interval shortens automatically. Default: 5 scalar. SpikeWatchPeriodThis parameter specifies the amount of time that suspicious time samples are received from a time source before these time samples are accepted as accurate. Time samples are considered suspicious when the time difference between the time sample and the client computer's local clock is larger than the value of LargePhaseOffset.
SpikeWatchPeriod is used in conjunction with HoldPeriod to help eliminate sporadic inaccurate time samples that are returned from a peer. UpdateIntervalThis parameter specifies the amount of time that W32time waits between corrections when the clock is being corrected gradually.
When it makes a gradual correction the service adjusts the clock slightly waits this amount of time and then checks to see if another adjustment is needed until the correction is finished.
General parameters:AnnounceFlagsThis parameter is a bitmask value that controls how time service availability is advertised through NetLogon. Default: 0x0a hexadecimal. Default: 0x02 hexadecimal bitmask. LocalClockDispersionThis parameter indicates the maximum error in seconds that is reported by the NTP server to clients that are requesting a time sample.
Default: 10 seconds. MaxPollIntervalThis parameter controls the maximum polling interval which defines the maximum amount of time between polls of a peer.
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