Configuring NTP on windows

Configuration on Windows 2000 Workstation

Windows 2000 (Win2K) uses a time service, known as Windows Time
Synchronization Service (Win32Time), to ensure that all Win2K computers on your network
use a common time. The W32Time Service is a fully compliant implementation of the
Simple Network Time Protocol (SNTP) as detailed in IETF RFC 1769. SNTP uses UDP port
123 by default. If you want to synchronize your time server with an SNTP server on the
Internet, make sure that port is available.

  • Select a NTP server, using 

net time /

  • Start the W32time service with

net start W32Time

You can also set the start option of the Windows Time
Synchronization Service (W32Time) to Automatic, so the service will start when
Windows/2000 starts.

Set the following Registry Entries for the W32Time Service (marked
in blue color)

The registry values are located in the following registry


  • AvoidTimeSyncOnWan : REG_DWORD (optional)

    Prevents the computer from synchronizing with a computer that is in another

    0 = the site of the time source is ignored [default]

    1 = the computer does not synchronize with a time source that is in a different


  • GetDcBackoffMaxTimes : REG_DWORD (optional)

    The maximum number of times to double the backoff interval when successive
    attempts to find a domain controller do not succeed. An event is logged every time
    a wait of the maximum length occurs.

    0 = the wait between successive attempts is always the minimum and no event is

    7 = [default]


  • GetDcBackoffMinutes : REG_DWORD (optional)

    The initial number of minutes to wait before looking for a domain controller if
    the last attempt did not succeed. 15 = [default] 


  • LocalNTP : REG_DWORD

    Used to start the SNTP server.

    0 = do not start the SNTP server unless this computer is a domain

    1 = always start the SNTP server


  • NtpServer : REG_SZ (

    NtpServer : REG_SZ (optional) Used to manually configure the time source. Set this
    to the DNS name or IP address of the NTP server to synchronize from. You can modify
    this from the command line by using the net time command. Value is blank by


  • Period : REG_DWORD or REG_SZ

    Used to control how often the time service synchronizes. If a string value is
    specified, it must be one of special ones listed below.

    0 = once a day

    65535, "BiDaily" = once every 2 days

    65534, "Tridaily" = once every 3 days

    65533, "Weekly" = once every week (7 days)

    65532, "SpecialSkew" = once every 45 minutes
    until 3 good synchronizations occur, then once every 8 hours (3 per day)

    65531, "DailySpecialSkew" = once every 45 minutes until 1 good synchronization
    occurs, then once every day

    freq = freq times per day


  • ReliableTimeSource : REG_DWORD (optional)

    Used to indicate that this computer has reliable time.

    0 = do not mark this computer as having reliable time [default]

    1 = mark this computer as having reliable time (this is only useful on a domain


  • Type : REG_SZ

    Used to control how a computer synchronizes.

    Nt5DS = synchronize to domain hierarchy [default]

    NTP = synchronize to manually configured

    NoSync = do not synchronize time

    The Nt5DS setting may not use a manual configured source.

The Adj and msSkewPerDay values are used to preserve information
about the computer’s clock between restarts. Do not manually edit these values.

More Information

For further information about NTP in
Windows/2000 see

For further information about NTP see

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