NorthEast Monitoring, Inc.

Sentinel Troubleshooting - Verifying the Operation of a Key

Last updated: 03/20/13


Please note:  If you incur a fatal error while using your software, there is a 2 minute delay before the USB key (dongle) is released from use and you may get an error in that it cannot be found.

There are 3 things you can try if your installation of Holter LX Analysis cannot find the USB key (dongle):

1.  Dongletest

Using an executable called “dongletest”, you should be able to see the Sentinel USB key (dongle) when it is plugged into your computer.  Sometimes, simply removing the USB key and plugging it in again, will remedy this problem.   Sometimes a different USB port helps. 


A new version of dongletest is included with 5.4D of the Holter LX Analysis software.  If you are using an earlier version of the software, you can download dongletest.exe from our web-site.   If you are using version 5.4D or later of the Holter LX Analysis software, you should be able to find dongletest in the bin directory.


If your USB key (dongle) is located on a server, you will want to run the dongletest from the command prompt.  Run dongletest as follows, inserting the USB key (dongle) server name or the IP address:


dongletest -s=server_name_or_IP             


Either way you run it, you should be able to see a list of any keys plugged into your computer and the serial numbers associated with each. If you cannot see the USB key (dongle), it can be either a firewall locking out ports 6001 and/or 6002 or another application using the ports.  To check for the latter on either machine, you can use the following, at the command prompt, running at the administrator level:


netstat –ab


This should show a list of names and ports (name:port).  The ports 6001 and 6002 should only show (in the format names: port) when the task following is spnsrvnt.exe and look something like:


UPD mycomputer: 6001 *.*



If this is not true or fails, you will need to try disabling all firewalls.  If that does not work, then you will need to search for the offending program which is using port 6001 and/or 6002.  Note, this is a problem with the LX Event installation and there is a file to fix in the LX Event installation directory to fix this.  (See 3. National Instrument Installation section.)


If the drivers on the system where the USB key (dongle) is installed have been corrupted, it may be necessary to uninstall and re-install the drivers.  It is required to install all functions of the drivers except the parallel key driver, this one is optional.  Some HP computers have a problem when the parallel driver is installed.


2.  Check the Sentinel Program to ensure that it is set up correctly

Run Control Panel and view all Programs that installed on the system.   Version 7.6.4 or later (Version 7.6.6 is required for Windows 7) of the “Sentinel Protection Installer” should be installed on the system.  If not, you will need to install it from the Holter LX Analysis install disk or download it from our web-site by clicking here.


If Sentinel V 7.6.4 or 7.6.6 is already installed, click on it and go to “Modify” the installation.  You will see a screen that looks something like this:



All options should be available, except that “Parallel Driver” may be turned off as depicted with the red X.  This is acceptable, however, some HP machines cannot tolerate the Parallel Driver being turned on, so if you have an HP, you may want to turn Parallel Driver off.


3. National Instrument Installation

If National Instrument is installed on your computer, you may need to update it.  There is a file that was provided with your LX Event software to correct the installation.  If you do not have the LX Event software, you will to obtain this file from us directly our web site at  Download, unzip and click on the file named national_port_fix.reg and allow the registry to run.