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Domain Time II Manager
Version 5.2

Other Management Tools

The Domain Time II Management tools include many useful diagnostic and utility programs. Many of these utilities are installed automatically when Manager is installed, and are located in the Domain Time II Program Folder (usually
C:\Program Files\Domain Time II). Others are installed when Server or Client are installed and found in the \System32 folder. Some are not installed by default, but only found in the original distribution file folders.

Click a link to jump to the description for the tool:

    .   DTCheck  - Multi-purpose Utility
    .   NTPCheck  - NTP Server Test
    .   DTClean  - Complete Removal Tool
    .   DTTest  - Time Server Test Utility
    .   LMCheck  - Simple Variance Check
    .   DTSync  - Sync Trigger
    .   DTRCPL  - Remote CPL
    .   DTSlew  - Manual Slew Utility
    .   DTLockDN  - Security Lockdown Tool


This multi-purpose utility can check statistics, trigger Domain Time synchronizations, check clock accuracy, open firewall ports for Domain Time II use, generate high-accuracy variance reports, and more. This tool is installed in the
/System32 folder on Server, Client, and Manager.

Domain Time II DTCheck utility
Domain Time II DTCheck utility   [Click for larger size]
Run DTCheck /? from a command prompt to see a list of all the available parameters and options.

You can examine the statistics (sample) of any Domain Time II server or client, force the synchronization of a particular machine (or of the entire time hierarchy), and generate a system-wide variance report (sample).

Note: DTCheck's variance reporting is much more accurate than LMCheck utility, since it uses higher accuracy protocols and sampling methods from installed Domain Time II components. Use this utility for variance reports on networks that have Domain Time Servers and Clients installed.

DTCheck can also be used to test your machine's clock for reliability. Run DTCheck /test to test your machine. You will probably need to reset the time after testing, since DTCheck will change the clock during the test.


A utility for testing NTP/SNTP time servers. Use this utility if you need to save NTP server tests to a file, or want to run regular tests in a batch file. This tool is installed in the
/System32 folder on Server, Client, and Manager.

Domain Time II NTPCheck utility
Domain Time II NTPCheck utility   [Click for smaller size]

    NTPCheck provides clock test information similar to that of DTCheck, but uses the NTP/SNTP protocol to query servers instead of the Domain Time II protocol. It is useful for determining whether or not a particular server is reachable and operating, and for comparing the time reported by multiple servers.

    NTPCheck is also useful for demonstrating the limits of NTP/SNTP accuracy. With the -raw option, you can see the results of other information derived from the NTP packets.

    For example, here are two actual sample reports generated by querying The first query shows the standard NTPCheck response; the second query shows the results of the -raw option.


Domain Time Removal Tool (DTClean)
DTClean is a utility that completely removes all traces of Domain Time II programs and registry settings from your system. This tool is included with Server, Client, and Manager. With Server and Client the tool is located in the distribution file folders; with Manager it is located in the Program Files\Domain Time II folders

Domain Time II DTClean Utility
Domain Time II DTClean Utility   [Click for larger size]

    DTClean should be used with care, since it removes all configuration settings as well as program executables. If you are upgrading to a newer version of Domain Time, you should use the Setup program or Domain Time II Manager instead.

    DTClean keeps a log of the components it removes, and you may save a copy of the log file for troubleshooting purposes or to supply to technical support if requested.


Use this utility to test the clock stability of any time server. Use it to determine which servers to use as time sources, or to troubleshoot accuracy issues.

Domain Time II Test Utility
Domain Time II Test Utility   [Click for larger size]

    To test a time server:

    1. Enter the server name or IP address of the time server you want to test in the Server field.
    2. Use the Proto drop-down list to select the time protocol to use for the test (this protocol must be running on the server being tested).
    3. Click the Start Button to begin the test.

    You may also want to adjust how many times and how rapidly to test each server by adjusting the Poll Interval and Number of Tests items. Different poll rates affect can affect how much detail you see in the server's response characteristics. You may want to compare a very rapid sample rate to the results from a fairly slow sample to see if the server has resolution or response issues when under rapid load.

    Hint: If you will be testing against a Domain Time II Server, you will want to temporarily disable the Denial-of-Service protection on the Server. If you don't, Server will interpret rapid test rates as a Denial-of-Service attack and stop responding to your tests.

    The test will show a running list and a real-time graph showing of the amount of latency detected in the network connection, and also how large a variance exists between your local system clock and the server being tested.

    Since both the local machine and the remote system clocks and protocols have some built-in inaccuracies, the values displayed will fluctuate occasionally. However, you should be able to see an overall trend in multiple tests - stable clocks will show a fairly consistent variance, unstable clocks will have constantly varying values.

    You can adjust the scale of the graph to show the graph in proper perspective to the accuracy you are expecting to achieve.


Use LMCheck to obtain a quick variance report and save the results to a file. Use this tool to do a quick & dirty check of network synchronization on a network that doesn't already have Domain Time II installed.

    .  Nothing to install -- remote machines only have to be running Windows (XP or later)*
    .  Just run the 32-bit or 64-bit version of LMCHECK.EXE from any Windows machine

    The Domain Time LMCheck test tool lets you roughly assess the current time of Windows machines on your network quickly and easily. It uses the built-in LAN Manager NetRemote TOD (Time of Day) function to check the time on all the machines in the browse list.

    Click the Start button to perform the scan. Click the Save Results button to pull the results up in Notepad so that you may save them wherever you wish.

    Time variances from the machine on which you run LMCheck are calculated and displayed, taking into account any network latencies. You may select the domain you wish to scan from the drop-down list.

    Note: The variance report generated by LMCheck cannot be as detailed or as accurate as variance reports provided by the Domain Time II Manager, the Monitor Service, the DTCheck utility, or Domain Time II Audit Server, each of which use much more accurate time protocols and sampling methods to measure the time differentials. Also, LMCheck cannot measure any systems not running Microsoft Networking (with NetBIOS enabled).

    Generally, you will only want to use LMCheck to obtain a quick snapshot of the time variance on networks where Domain Time is not yet installed.

    Although it is included as part of the licensed Domain Time II Management Tools, LMCheck itself is freeware, and can be downloaded separately and freely distributed as long as the program is unmodified.

    *Target machines must be running Microsoft Networking (with NetBIOS-enabled) and respond to NetRemoteTOD queries.



Domain Time II Remote CPL (DTRCPL)
Use the Remote CPL utility to quickly connect to a Domain Time II Server or Full Client and change its Control Panel Applet settings. This is a useful utility when all you need to do is change a control panel applet setting and you don't need the full power of Domain Time II Manager.

    Choose a machine running Domain Time II Server or Full Client from the drop-down list, browse list, or enter its IP address, DNS name, or NETBIOS name into the Machine field. If the connection is successful, you will be presented with a locally-running version of the remote machines' Domain Time II Control Panel Applet. You will then be able to make all the configuration changes you would if you were actually using the remote machine (with the exception of running Time Source tests).

    The DTRCPL utility is subject to the same requirements as Domain Time II Manager in order to connect to and control a remote system:

    1. Your network must be a correctly-configured Windows network, i.e. configured with working name resolution (DNS, WINS, NetBIOS, etc.), correct and functioning Active Directory (if used), working inter-domain trusts, etc.

    2. Your network must pass both UDP and TCP network traffic sent to destination port 9909. Switches and firewalls must pass this traffic bi-directionally, since traffic will originate either from Manager or the remote machines. Your network must pass this traffic, regardless of what time protocols are used to actually synchronize the time.

Note: As of Version 5.2.b.20150821, Domain Time supports automatic management of the Windows Firewall to allow access to the required time protocol and control ports. See Auto-Manage Windows Firewall Settings for detailed information.

  • The remote machine must respond to PING requests from the connecting machine.

  • The connecting Domain Time program, utility, or service must be run using credentials with sufficient privileges to connect to and write files to the administrative shares on the remote machine using Microsoft Networking (Domain Admin if the target is a domain member, Local Machine Administrator if the target is in a workgroup).

  • The Remote Registry Service must be running on the remote systems and its registry keys must be accessible to the connecting program.


Use this utility to trigger a sync on specified machines from the command line.

Domain Time II DTSync utility
Domain Time II DTSync utility   [Click for larger size]

    Run DTSync from a command prompt to see a list of all the available parameters and options.

    DTSync allows you to specify timeouts and to set the ERRORLEVEL variable so you can create robust batch files to reliably trigger synchronization, even across WAN links.


This utility allows you to smoothly slew the local clock by large amounts.

Domain Time II DTSlew Utility
Domain Time II DTSlew Utility   [Click for larger size]
Use this utility to move the local clock forward or backward by the amount you specify. The clock will be advanced or retarded using slewing, so you can make the change smoothly with no clock stepping or backwards clock movement.

This is useful if you have to manually change the time on machines running critical services that must have smooth forward clock movement at all times. DTSlew also allows you to make larger changes than would normally be possible by Domain Time Server or Client.

The rate of change is limited to the maximum amount of slewing possible by the hardware on the motherboard. DTSlew will not allow you to select a rate that is outside of these limits.

Note: You will need to stop the Domain Time Server or Client service before running DTSlew in order to prevent conflicts over clock ' control.

Do NOT attempt to serve time from a machine running DTSlew, this will cause unpredictable results on your clients as they attempt to track with the time server (such as unexpected stepping).


Domain Time Lockdown (DTLockDN)
Domain Time Lockdown is a command-line tool for system administrators to use to help secure (harden) their Domain Time installations.

Domain Time II DTLockDN Utility
Domain Time II DTLockDN Utility   [Click for larger size]

  • Who needs it?

    Domain Time Lockdown is useful to system administrators as part of an overall company-wide security policy.

  • What does it do?

    Domain Time Lockdown lets you set permissions for

    1. The Domain Time service object

      The service object is the handle presented by the operating system to programs wanting to control the service. Just like files or other objects, the service object may have permissions associated with it. Service object permissions control who is allowed to stop, start, query, or configure the service.

    2. The operating system's services database

      The operating system maintains an internal database of service objects, including their current status, their permissions, and their settings. Most of this information is stored in the registry under HKLM\System\CurrentControlSet\Services. Ordinary users do not have permission to modify these settings. This area is where the operating system keeps the name of the service executable file, the restart on failure options, the startup type, and so forth.

    3. The Domain Time parameters stored in the registry

      Domain Time keeps its configuration in HKLM\Software\Greyware\product, where product may be either Domain Time Client or Domain Time Server. Information in this area controls what Domain Time does once it is running as a service (time sources, how often to check, system timings, logging options, and all other settings).

    4. The Domain Time service executable (domtimec.exe or domtimes.exe)

      The main service executable lives in the system32 directory. Administrators (and often users) have rights in both the containing folder and the individual files. If users have the right to add or delete files in the folder, they can also delete or rename the service executable, even if the executable file itself is restricted to read-only or has a specific deny ACE protecting it from deletion. The only way to prevent a user who has delete rights for the folder from deleting an individual file is to add a null ACE (effectively remove all permissions). Therefore, unlike the other objects, when you set a user or group to have only READ access, the program will actually remove all access from the executable file for that user or group.

  • Aren't the default permissions sufficient?

    In most circumstances, yes. Non-administrative users typically don't have the ability to stop, remove, or even install services. They may have limited abilities to control what the running service does, or trigger it to take certain actions—these options vary by the service, and Microsoft and other vendors typically use sensible defaults to help ensure that only administrators can change vital settings.

    However, home users (and even some business users) may use an administrative account as their primary logon. Security experts strongly discourage this practice, and Microsoft's own UAC has taken steps to help mitigate the dangers of logging on this way, but nevertheless it is not uncommon for ordinary users to find themselves with full administrative control over their machines, perhaps without even realizing it.

    Other accounts or groups sometimes have unintended privileges. On regular workstations, the Power Users group typically has additional control over services. On Domain Controllers, the Server Operators group has similar privileges. Individual accounts or other groups may also be configured to have extended privileges using system or domain policies.

  • How does it work?

    Domain Time Lockdown edits or replaces the access control lists to restrict control access and optionally enable auditing. It can also set the service to restart automatically if killed. (The Microsoft property page for service control only allows setting the restart time on the order of minutes; Domain Time Lockdown lets you set a restart time in milliseconds.)

    Domain Time Lockdown only supports READ or FULL permissions. READ permissions are required in order for users to query the service, see the current settings, and operate the computer normally. FULL permissions include all READ permissions plus the ability to stop, remove, upgrade, or configure the service.

    For example, you could use Domain Time Lockdown to grant FULL permissions to the built-in Administrator account while granting only READ permissions to the built-in Administrators group. This would allow anyone logged in as the local built-in Administrator to control the service, while other members of the Administrators group (including Domain Admins if the machine is a member of a domain) could only view the settings.

    There is no predefined hardening for a service, because what access you need to restrict and what access you need to allow is dependent on your network's policies and configuration.

  • Syntax

      dtlockdn [service="Service Display Name"] [options...]

      Options containing embedded spaces must be enclosed in quotation marks.

      If you do not specify service= and a service name, the program will look for either Domain Time Client or Domain Time Server (whichever) is installed. If you do specify a service name, it may be any installed service on the machine. We do not support using this program on services other than Domain Time Client or Domain Time Server.


      /Show Show current settings; do not make any changes.
      /Restart=nnn Set service to auto-restart if killed after nnn milliseconds.
      /NoRestart Set service to not auto-restart if killed.
      /Audit 1 Enable auditing of unauthorized access.
      /NoAudit Disable auditing of unauthorized access.
      /Full="Account" 2 Grant "Account" full control of the service.
      /Read="Account" 2 Restrict "Account" to read-only access to the service.
      /Revoke="Account" 2 Remove "Account" from the service's access control list.
      /Replace 3 Replace permissions instead of merging them.
      /ServiceOnly Apply security only to the service object and executable.
      /RegistryOnly Apply security only to the registry objects.
      /Yes Do not ask for confirmation before making changes. You may use either /Yes or /Y.
      /Password="password" 4 Set password to lock out subsequent changes. If a password is set, you must provide exactly the same password in the future, or the program will refuse to perform. The only way to clear a password once it has been set is by issuing the /Reset command with the correct password.
      /Reset 4 Reset the service and registry to default access (read for ordinary users, full control for administrators and the system). If you have set a password using the /password option, you cannot reset the service without providing the correct password again.
      1  Enabling auditing with this program sets the appropriate bits in each object's SACL to allow the system to record failed access in the system's security log. If your machine's policy does not have failure auditing enabled for object access, then no entries will appear in the security log.
      2  You may specify a username or a group name for Account. If the name contains embedded spaces, you must enclose it in quotation marks. You may use plain names, such as Users, "Power Users", Administrator, or Joe to refer to accounts or groups on the local machine. You may also refer to domain users or groups this way. If there is any chance of account name duplication throughout your domain or forest, you should specify the full names: BUILTIN\Administrator, "BIGCORP\Domain Admins" or other fully-qualified names. In some circumstances, depending on your active directory configuration, you may be able to use the form to specify individual accounts.
      3  The program will ensure that the special SYSTEM account always has full control. It is an error to specify SYSTEM as an account on the command line. The program will also ensure that ordinary users and administrators will have the ability to read values they should read, even if you try to /Revoke those permissions, or use /Replace without specifying all the necessary accounts.
      4  Exercise caution when using the optional /password option. Once you enter a password, you must provide it again exactly the same way in order to use the program again. For example, MyPassword, mypassword, and MYPASSWORD are three different passwords. If your password contains embedded spaces, you must enclose it in quotation marks. The best password contain a mixture of upper-case and lower-case letters, numbers, and punctuation marks. Passwords are stored using one-way encryption, so we cannot help you recover your password if you forget.

      Once a password is set, you must provide it for each use of the program thereafter. The only way to clear a password is to use the /Reset command, but you must provide the current password to do so. After a reset, you may then set a different password if desired.


      dtlockdn /full=Administrator /read=Administrators /replace

        This example allows the built-in Administrator account to control the service, but blocks all other members of the Administrators group. Any permissions granted by inheritance or prior operations will be replaced.

      dtlockdn /restart=1000

        This example changes only the service's auto-resetart time. If the service dies unexpectedly, or is killed using Task Manager or another tool, it will restart in 1000 milliseconds (one second).

      dtlockdn /full="Domain Admins" /full=Administrator /read=Administrators /replace /restart=1000 /password="nzlwOOFm_#gadlob88$" /yes

        This example is similar to the first example, but also grants the group Domain Admins full control, sets the service to restart automatically if killed, sets a password, and suppresses the prompt before executing.

      dtlockdn /reset /password="nzlwOOFm_#gadlob88$"

        This example recovers control after permissions have been locked down. The security will be reset to generic defaults, and the password will be removed. Note that if a password hadn't been set, any user with full administrative rights on the machine could have issued the /Reset command and then reconfigured the security and perhaps have added a different password.


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Domain Time II Software distributed by Microsemi, Inc.
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