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In some emulator products it is possible to configure the number of retries and the waiting time between them by adding parameters to the emulator configuration file. Please refer to the product documentation for the details regarding the relevant parameters: license_retry_period and license_retry_count parameters (obsolete starting with version 1.10)

2. At regular intervals during the runtime of the emulator (the default license check period of 1 hour can be changed by Stromasys using the appropriate license parameters):

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A software license does not require any special hardware but it still requires installation of the Sentinel runtime environment. 

Please note:

• To avoid unexpected problems, do not use any Sentinel runtime software that was not provided by Stromasys without being advised to do so by your Stromasys representative.
• Software licenses are best suited for stable environments, because their correct function depends on certain characteristics of the host system. Changing any of these characteristics will invalidate the license.
  • If the Charon host runs on real hardware, software licenses are by default tightly bound to the hardware for which they were issued. If major hardware characteristics of the system are changed, the license will be disabled.
  • If the Charon host runs in a virtual environment (e.g., VMware), software licenses are normally bound to the virtual machine ID and a set of additional characteristics of the virtual machine. If any of these parameters are changed, the license will be disabled.
• Software licenses are very sensitive to even small changes on the host system. Therefore, it is especially important to provide for a backup license that will ensure continued operation should there be a problem with the software license. See Handling Multiple License Keys and Product Licenses for details.

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• If you have not installed the license server yet (and for any more in-depth information), please refer to the VE license server user's guide (see Licensing Documentation).

• The information below shows the command-line tools for license management. Starting with version 1.1.16 of the VE license server, these activities can also be performed using a web-based management GUI. Please refer to the appropriate VE license server user's guide (see chapter VE License Server Web-based Management GUI in the VE license server documentation under Licensing Documentation).

VE Licensing Certificates Overview

This section applies to Charon-PAR version 3.0.11 and later.

This section provides a short overview of the certificates used by the VE license server and Charon-PAR. Please refer to the VE license server documentation for details.

The VE license server uses certificates for different purposes:

• License server operation: encrypted communication between license server and license clients (emulators).

  • New certificate support in the VE license server started with version 2.1.3. Changed certificate names starting with VE license server 2.2.2.

  • New certificate support for Charon-PAR started with version 3.0.11.

• Web-based management GUI: encrypted (HTTPS) communication between the integrated license server web server and web browsers. Starting with VE license server version 2.1.4, the name of the certificate and its management changed. Please refer to the VE license server documentation.

Important information:

• General VE license server configuration:

  • The VE license server will – by default – use the old certificates. Therefore, compatibility with existing Charon clients will be maintained during an upgrade of the license server.

  • If the new certificates (using pre-defined names) are present in /opt/license-server/certs, these will be used and clients will have to use matching certificates. Please refer to the VE license server documentation for information how to activate the new certificates and, if desired, create custom certificates.

• Checking if the new certificates are enabled in a Charon-PAR installation:

  • Certificate location: /opt/charon/bin/certs

  • Sample certificate names: ca.crt.sample, charon.crt.sample, and charon.key.sample

  • If the directory contains the above files without the .sample suffix (e.g., ca.crt, charon.crt, charon.key), the new certificates have been enabled. On the license server, the sample files (for root CA and license server) are in /opt/license_server/certs. Please see the VE License Server guide in License Documentation for more information.

• Make sure you understand the implications and possible side-effects before changing the certificate configuration. Incorrect configurations can lead to the loss of license access and interruptions in operation.

Firewall Considerations

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