MATLAB: Am I unable to use toolboxes from a redundant license server configuration in MATLAB

MATLAB

My MATLAB installation connects to redundant license servers to obtain a license. Whenever I try to use a toolbox function I get an undefined function or variable error for that function. If I try to checkout a license for that particular toolbox, I receive:

ERROR: License Manager Error -5

Best Answer

After a redundant server installation is complete, the client license file should be removed, with an environment variable used in its place. If the environment variable is not used, MATLAB may not be able to check out licenses of toolboxes or blocksets. To update the client configuration, see the information below:

On the client, the license file is called network.lic and is located in $MATLAB/licenses (where $MATLAB is the MATLAB installation location). This file should be removed and replaced with the environment variable "MLM_LICENSE_FILE". The environment variable that should be added is as follows:

MLM_LICENSE_FILE=port@server1,port@server2,port@server3

- "port" refers to the license manager daemon, which is the number at the end of the SERVER line in the license file (by default the port is 27000).

- "server" refers to the hostname of each of your servers, as defined in the SERVER lines of the license file.

NOTE: The entries in the environment variable must be separated by commas (","), not semicolons (";") or colons (":").

Alternatively, you can use the variable LM_LICENSE_FILE, which can be used for all Flexlm applications. If using this alternative, please make sure that this does not override an existing variable.

Once the variable has been set and the network.lic file has been removed, toolboxes should be accessible the next time MATLAB is started.

Related Solutions

MATLAB: What are the differences between the license.lic, license.dat, network.lic, and license_info.xml license files

There are four different types of license file:

license.lic

For Individual or Designated Computer licenses, this is a standard license file generated from the MathWorks License Center. If this license is automatically generated during installation, it will also contain the hostname, license number and release in the filename.
For Concurrent or Network Named User licenses, this is an unprocessed license file used to install the network license manager. It is also generated on the MathWorks License Center. On network licenses, the license.lic file is *only *used for the installation of the network license manager.

license_info.xml

The license_info.xml file is used for Individual licenses with Login Named User enabled.
This type of license file is common for trial licenses and licenses being used on cloud compute services.
The license_info.xml file contains no license data; rather it instructs MATLAB to connect to MathWorks on launch to authenticate the license.
If a license_info.xml file is in place, you will be prompted to enter your MathWorks Account credentials upon launching MATLAB.

license.dat

The license.dat is a processed license file that is created during the installation of the network license manager on the license server. When the network license manager is installed using the MATLAB installer, the license.dat is placed in the $MATLAB/etc folder (where $MATLAB is the installation directory).
The license.dat contains two additional lines at the top of the file, the SERVER line and the DAEMON line. These lines are generated by the installer and contain information specific to the machine the installer was run on.
The license.dat is used during the installation of MATLAB on network clients.
You can manually convert a license.lic to a license.dat by adding the SERVER and DAEMON lines and changing the file extension from .lic to .dat.
The syntax for the SERVER and DAEMON lines is as follows:

SERVER {hostname} {HostID} 27000
DAEMON MLM {$MATLAB}/etc/MLM

network.lic

The network.lic is created when a license.dat is provided during installation of a network client installation. Similarly, when a network client installation is activated using the MATLAB activation client, the network.lic is placed in the $MATLAB/licenses folder (where $MATLAB is the installation directory).
The network.lic contains two lines, a SERVER line and the USE_SERVER directive.
You can manually convert a license.dat to a network.lic by deleting everything but the first line and replacing it with the USE_SERVER directive.
The network.lic can be used instead of the license.dat for activation of a network client installation.
The network.lic is only used on network client computers.
The syntax for the file is as follows:

SERVER {hostname} {HostID} 27000
USE_SERVER

Please note that with the exception of the license_info.xml license file, these names are conventions, not rules. The exact names and functions of these files may vary depending on your local MATLAB configuration. Any questions related to your specific usage should be directed to your license administrator.

MATLAB: How to transition away from the Redundant Server (Triad) setup

The steps for transitioning your MATLAB client machines from a Redundant Server (3 servers) to a single server will depend on the method your client machines use to locate the license server:

Redundant Server to Single Server setup using environment variables

On your client machines, you will have an existing MLM_LICENSE_FILE (or LM_LICENSE_FILE) environment variable that follows this syntax:

MLM_LICENSE_FILE=port@hostname1,port@hostname2, port@hostname3

Change this value so that the environment variable only points to the single license server you have setup now. The syntax will look like this:

MLM_LICENSE_FILE=port@license_server_hostname

Redundant Server to Single Server setup using a network.lic file

On your client machines, locate the network.lic file that MATLAB is using. If you are unsure where to find this file on your computer, reference this article:

Where are the license files for MATLAB located?

https://www.mathworks.com/matlabcentral/answers/99147

Once you find the network.lic file, open it in a text editor. The syntax for the file will contain 3 SERVER lines. Delete the contents of this file and input the following syntax for your single license server instead:

SERVER {license_server_hostname} {license_server_HostID} 27000

USE_SERVER

Best Answer

Related Solutions

MATLAB: What are the differences between the license.lic, license.dat, network.lic, and license_info.xml license files

MATLAB: How to transition away from the Redundant Server (Triad) setup

Related Question