There are 4 parameters that specify how a client program communicates with a remote server. The first is the server address, which can be specified using a name, such as time-a. Both of these specifications are equivalent, although the numerical form is what is actually used by the system - the name is converted to the numerical form automatically. In general, the name is more convenient to use, but the numerical form requires less overhead to process and is generally preferred if you are going to make many requests to the same server.
The second parameter is the protocol, which specifies the format of the messages that are exchanged. The NIST servers support two common protocols: tcp, the transmission control protocol, and udp, the user datagram protocol. Finally, the third and fourth parameters are the port numbers on the client and the server.
The server port number specifies which program on the NIST server will actually handle your request and the client port number specifies which program on your system will handle the response.
The port number on your system is arbitrary, and is usually chosen at random by your system each time the client program prepares to make a request for the time. Therefore, it is likely to vary from one request to another. However, the NIST time servers will only listen for and respond to requests addressed to a few specific port numbers and protocols.
Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Caution Don't use the Net time command to configure or set a computer's clock time when the Windows Time service is running. Note If you have a computer with multiple network adapters is multi-homed , you cannot enable the Windows Time service based on a network adapter.
Important Windows Server has improved the time synchronization algorithms to align with RFC specifications. Note 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. Note When you remove a Group Policy setting, Windows removes the corresponding entry from the policy area of the registry.
Warning This information is provided as a reference for use in troubleshooting and validation. Note Some of the parameters in the registry are measured in clock ticks and some are measured in seconds. Ticks Property. Submit and view feedback for This product This page.
View all page feedback. In this article. Registers the Windows Time service to run as a service and adds its default configuration information to the registry. Unregisters the Windows Time service and removes all of its configuration information from the registry. Monitors the Windows Time service. Converts a Windows NT system time measured in 10 -7 -second intervals starting from 0h 1-Jan into a readable format. Converts an NTP time measured in 2 -second intervals starting from 0h 1-Jan into a readable format.
Tells a computer that it should resynchronize its clock as soon as possible, throwing out all accumulated error statistics. Displays a strip chart of the offset between this computer and another computer.
Displays the values associated with a given registry key. Displays the computer's Windows Time service information.
Enables or disables the local computer Windows Time service private log. Controls whether this computer is marked as a reliable time server. A computer is not marked as reliable unless it is also marked as a time server. Not a time server 0x Always time server 0x Automatic time server 0x Always-reliable time server 0x Automatic reliable time server The default value for domain members is Controls whether or not the chaining mechanism is disabled.
If chaining is disabled set to 0 , a read-only domain controller RODC can synchronize with any domain controller, but hosts that do not have their passwords cached on the RODC will not be able to synchronize with the RODC. Specifies the maximum amount of time that an entry can remain in the chaining table before the entry is considered to be expired. Expired entries may be removed when the next request or response is processed.
The default value is 16 seconds. Controls the frequency at which an event that indicates the number of successful and unsuccessful chaining attempts is logged to the System log in Event Viewer. The default is 30 minutes. Controls the maximum number of entries that are allowed in the chaining table. If the chaining table is full and no expired entries can be removed, any incoming requests are discarded. The default value is entries. Controls the maximum number of entries that are allowed in the chaining table for a particular host.
The default value is 4 entries. Specifies the smallest local clock adjustments that may be logged to the W32time service event log on the target computer. The default value is parts per million - PPM.
Indicates the maximum number of seconds a system clock can nominally hold its accuracy without synchronizing with a time source. If this period of time passes without W32time obtaining new samples from any of its input providers, W32time initiates a rediscovery of time sources. Default: 7, seconds. Controls which events that the time service logs.
Time jump 0x2. Source change The default value on domain members is 2. The default value on stand-alone clients and servers is 2. Controls the rate at which the clock is corrected. If this value is too small, the clock is unstable and overcorrects. If the value is too large, the clock takes a long time to synchronize.
The default value on domain members is 4. The default value on stand-alone clients and servers is 4. Controls the period of time for which spike detection is disabled in order to bring the local clock into synchronization quickly. Specifies that a time offset greater than or equal to this value in 10 -7 seconds is considered a spike. Maintained by W32Time. Controls the dispersion in seconds that you must assume when the only time source is the built-in CMOS clock.
Specifies the maximum offset in seconds for which W32Time attempts to adjust the computer clock by using the clock rate. Specifies the largest negative time correction, in seconds, that the service makes.
Specifies the largest interval, in log2 seconds, allowed for the system polling interval. Specifies the largest positive time correction in seconds that the service makes. Specifies the smallest interval, in log base 2 seconds, allowed for the system polling interval. Controls the rate at which the phase error is corrected. Controls the decision to increase or decrease the poll interval for the system. Controls whether or not the DC will respond to time sync requests that use older authentication protocols.
Specifies the amount of time that a suspicious offset must persist before it is accepted as correct in seconds. An unsigned integer that indicates the time jump audit threshold, in seconds. Specifies the number of clock ticks between phase correction adjustments. Value of 1 indicates that W32Time uses multiple SSL timestamps to seed a clock that is grossly inaccurate. Indicates that non-standard mode combinations are allowed in synchronization between peers.
The default value for domain members is 1. Specifies a space-delimited list of peers from which a computer obtains time stamps, consisting of one or more DNS names or IP addresses per line. Computers connected to a domain must synchronize with a more reliable time source, such as the official U. The default value on stand-alone clients and servers is time. Indicates which peers to accept synchronization from: NoSync. The time service does not synchronize with other sources. The time service synchronizes from the servers specified in the NtpServer.
The time service synchronizes from the domain hierarchy. Distributed Transaction Coordinator. Distributed File Replication Service. Fax Service. Microsoft Exchange Server. File Replication Service. Group Policy. Local Security Authority. Remote Storage Notification. Remote Storage Server. Systems Management Server 2. Terminal Services Licensing. Terminal Services Session Directory. Computer Browser. Net Logon. License Logging Service. Performance Logs and Alerts.
Print Spooler. Remote Procedure Call Locator. SNMP Service. LDAP Server. DC Locator. Exchange Server Kerberos Password V5. File Server for Macintosh. Installation Bootstrap Service. Installation Bootstrap protocol server. Installation Bootstrap protocol client.
Microsoft Operations Manager Microsoft SQL Server. SQL Probe.
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