(LMS1) Troubleshooting a parallel port dongle

Technical Note 170914



9/24/2020 1:04 PM

This applies to IAR Embedded Workbench legacy versions (up to 2012-2013) which used LMS1, (where LMS1 stands for: License Management System version 1).


This technical note gives suggestions on how to troubleshoot a parallel port dongle.

Important - a parallel port dongle requires:

  • A 32-bit Windows system.
  • Windows 7 or older Windows system.

Related technical notes:


When a parallel port dongle isn’t detected by the computer, a typical message is:

‘No valid license found for this product’.

These actions often help to re-establish the connection between the computer and the parallel port dongle:

  1. Install latest IAR License Manager 1.xx and install dongle driver tested for LMS1
  2. Repair the dongle driver
  3. Use the SafeNet tool Medic to check the dongle
  4. Change the settings for the parallel port
  5. Check the physical parallel port
  6. Remove the dongle driver support for USB dongles

1. Install latest IAR License Manager 1.xx and dongle driver tested for LMS1

LMS1 should now detect the parallel port dongle. If not, continue with steps 2 to 6. After each step, check the dongle. If not detected, take next step.

2. Repair the dongle driver

Note - If updating the driver installation on a computer that runs the IAR License Server application, restart the server application or rebooted the computer.

Try to repair the dongle driver.

  • Choose Start > Settings > Control Panel > Add/Remove Programs.
  • Select Sentinel Protection installer 7.5.2.
  • Perform the Repair action.

3. Use the SafeNet tool Medic to check the dongle

These actions will test the dongle with a SafeNet tool.

  • For dongle drivers version 5.41.1 and later, download and use SuperProMedic.
  • For dongle drivers older than version 5.41, download and use SentinelMedic.

The information gained from running Medic is summarized below:

  • System Driver Information:  Displays the system driver that is installed on your system, or the error that occurred trying to communicate with the system driver. Note: If you cannot see a version number in the window, this is a strong indication that there is something wrong with the installed drivers.
  • Error/Status and Description:  This area displays the error/status of the search for the key. Medic will display a brief description of the error/status.  
  • Medic Says:  This button will display Medic's recommendations (if any) for fixing the problem.  

4. Change the settings for the parallel port

Change the parallel port settings in the driver configuration application.

The location and name of the application depends on which operating system and driver version you use. Examples of locations are:

C:\Program Files\Common Files\SafeNet Sentinel\Sentinel System Driver\SetupSysDriver.exe
C:\Program Files\Rainbow Technologies\Sentinel System Driver\SetupSysDriver.exe
C:\Program Files\Common Files\IAR Systems\License\SDongle\WIN_NT\Setupx86.exe
C:\Program Files\Common Files\IAR Systems\License\SDongle\WIN_9X\Sentw9x.exe

Try these actions:

  • Change the driver configuration in the setup program to the same parallel port mode as in the BIOS settings. If this does not help, try changing the settings in the BIOS.
  • If the parallel port is set to [Auto], change to [Enabled]. This change usually solves many problems.
  • Set the parallel port mode to lowest possible, that is, uni-directional, standard, AT-Compatible or similar, and use the same settings for the driver configuration.  

On notebook computers - also try these actions:

  • Connect to main power, but do not connect to the docking station.
  • Turn off energy saving features in Windows and BIOS.  

5. Check the physical parallel port

Try these actions:

  • Check that the parallel port itself is working by, for example, connecting a printer and try printing.
  • Try the dongle as the only device on the parallel port.
  • Try the dongle with a printer connected to it.

The hardware lock system requires that the parallel port fulfills a basic technical standard:

  • The port must be bi-directional (allow both reading and writing). This prevents it to be used with some notebook computers.
  • The port needs to be able to provide a certain voltage level on some pins. Connected equipment, like printers, behind the hardware lock could possibly decrease the voltage level so that the hardware lock fails.

6. Remove the dongle driver support for USB dongles

These actions remove the driver sub-system that communicates with USB dongles.

  • Choose Start > Settings > Control Panel > Add/Remove Programs.
  • Select Sentinel Protection installer 7.5.2 (latest tested version for LMS1)
  • Click Change.
  • Click Yes / Next until you get a window with choice of drivers to install.
  • Click the ‘disk icon’ to the left of the phrase Parallel System Driver.
  • From the drop-down menu, choose This feature will not be available.
  • Select Next until the installation application ends.


The suggestions in Discussion usually establish connection to the parallel port dongle.

If you still cannot establish contact with the parallel port dongle, contact IAR Systems support for assistance. Mention that you have followed the advice in technical note 170914.

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