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Machine Policies > System > Windows Time Service > Time Providers >

Configure Windows NTP Client

Policy Details

Policy ClassMachine
Supported OnAt least Windows XP Professional or Windows Server 2003 family
ADMX FileW32Time.admx
Requires RebootFalse
Requires Log OffFalse

Registry Location

The following registry values are involved in this policy.

"HKLM\Software\Policies\Microsoft\W32time\Parameters!NtpServer
HKLM\Software\Policies\Microsoft\W32time\Parameters!Type
HKLM\Software\Policies\Microsoft\W32time\TimeProviders\NtpClient!CrossSiteSyncFlags
HKLM\Software\Policies\Microsoft\W32time\TimeProviders\NtpClient!ResolvePeerBackoffMinutes
HKLM\Software\Policies\Microsoft\W32time\TimeProviders\NtpClient!ResolvePeerBackoffMaxTimes
HKLM\Software\Policies\Microsoft\W32time\TimeProviders\NtpClient!SpecialPollInterval
HKLM\Software\Policies\Microsoft\W32time\TimeProviders\NtpClient!EventLogFlags"

Official Explanation

"Specifies a set of parameters for controlling the Windows NTP Client.

NtpServer: The Domain Name System (DNS) name or IP address of an NTP time source. This value is in the form of "dnsName,flags" where flags is a hexadecimal bitmask of the flags for that host. For more information, see the NTP Client Group Policy Settings Associated with Windows Time section of the Windows Time Service Group Policy Settings (http://go.microsoft.com/fwlink/?LinkId=139727). The default value is "time.windows.com,0x09".

Type: This value controls the authentication that W32time uses. The default value is NT5DS.

CrossSiteSyncFlags: This value, expressed as a bitmask, controls how W32time chooses time sources outside its own site. The possible values are 0, 1, and 2. Setting this value to 0 (None) indicates that the time client should not attempt to synchronize time outside its site. Setting this value to 1 (PdcOnly) indicates that only the computers that function as primary domain controller (PDC) emulator operations masters in other domains can be used as synchronization partners when the client has to synchronize time with a partner outside its own site. Setting a value of 2 (All) indicates that any synchronization partner can be used. This value is ignored if the NT5DS value is not set. The default value is 2 decimal (0x02 hexadecimal).

ResolvePeerBackoffMinutes: This value, expressed in minutes, controls how long W32time waits before it attempts to resolve a DNS name when a previous attempt failed. The default value is 15 minutes.

ResolvePeerBackoffMaxTimes: This value controls how many times W32time attempts to resolve a DNS name before the discovery process is restarted. Each time DNS name resolution fails, the amount of time to wait before the next attempt will be twice the previous amount. The default value is 7 attempts.

SpecialPollInterval: This NTP client value, expressed in seconds, controls how often a manually configured time source is polled when the time source is configured to use a special polling interval. If the SpecialInterval flag is enabled on the NTPServer setting, the client uses the value that is set as the SpecialPollInterval, instead of the MinPollInterval and MaxPollInterval values, to determine how frequently to poll the time source. The default value is 3600 seconds (1 hour).

EventLogFlags: This value is a bitmask that controls events that may be logged to the System log in Event Viewer. Setting this value to 0x1 indicates that W32time will create an event whenever a time jump is detected. Setting this value to 0x2 indicates that W32time will create an event whenever a time source change is made. Because it is a bitmask value, setting 0x3 (the addition of 0x1 and 0x2) indicates that both time jumps and time source changes will be logged.

"

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