MATLAB: Do I receive “(MLM) Not master server, checkout attempt of ‘MATLAB’ from user@host refused” in the license manager log file

MATLAB

Clients are reporting they receive License Manager Error -18 when they try to start MATLAB, and I am seeing errors in the log file. Why do I receive "(MLM) Not master server, checkout attempt of 'MATLAB' from user@host refused" in the license manager log file?

Best Answer

This error message indicates the DAEMON line is not formatted correctly. Possible errors include placing the quotations that normally surround the MLM path around additional parts of the DAEMON line. For example, if a static port number is being used, the following line would be incorrectly formatted and would cause this error:

DAEMON MLM "C:\Program Files\MATLAB\R201Xx\etc\win64\mlm.exe port=27001"

Instead, the line should move the quotation to only surround the MLM path:

DAEMON MLM "C:\Program Files\MATLAB\R201Xx\etc\win64\mlm.exe" port=27001

Clients will receive License Manager Error -18 when this error is written to the log file. If you are unable to resolve the error, please contact MathWorks Licensing and Installation Support, including your license file for analysis.

Related Solutions

MATLAB: Do I receive a “File not found” error message in the license manager log file after starting the network license manager

This errror occurs when the network license manager is installed in a your path that has a folder with spaces such as Program Files. When this is the case, the DAEMON line in the license file must specify the path to mlm.exe with double quotes. If you do not put quotes in the path, the license manager will be unable to find the mlm.exe file.

To resolve this issue, open the license.dat file for the license manager and locate the DAEMON line. Enclose the path to the mlm.exe in quotes. For example:

DAEMON MLM "C:\Program Files\MATLAB\R2007b\flexlm\mlm.exe"

Once updated, Stop and restart the license manager to resolve the issue.

MATLAB: Do I receive License Manager Error -3

There are a few reasons why this error can occur:

1) The DAEMON line in your license.dat file is incorrect or missing.

For license server, the DAEMON line should read:

Windows

---------

 DAEMON MLM $MATLAB\etc\win{32|64}\mlm.exe ($MATLAB\flexlm\mlm.exe for releases prior to R2010b on Windows)

(where $MATLAB is the MATLAB installation directory)

Linux/Mac

------------------

 DAEMON MLM $MATLAB/etc/glnx{86|a64}/MLM

(where $MATLAB is the MATLAB installation directory)

(NOTE: prior to R2011a, the DAEMON line on Linux/Mac was "DAEMON MLM $MATLAB/etc/glnx{86|a64}/lm_matlab")

NOTE: Once you have made changes to your license file, be sure to restart the network license manager for these changes to take effect. For more information on how to restart the license manager, see the Related Solution listed below.

2) The SERVER line in the license.dat file on a client does not match the license.dat file on the server.

If you are running MATLAB using a concurrent license and you are on a client machine, make sure the SERVER line in your license.dat file matches that of the license.dat file on your license server.

The license file on the client machine varies depending upon operating system and version. For R2008a and above, the license file is generally called network.lic and is located in $MATLAB\licenses (where $MATLAB is the MATLAB installation directory). For versions prior to R2008a, the license file will generally be the following:

Windows

---------

 $MATLAB\bin\win32 (for 32-bit MATLAB)
 $MATLAB\bin\win64 (for 64-bit MATLAB)

Linux/Unix/Mac

------------------

 $MATLAB/etc

(where $MATLAB is the MATLAB installation directory)

The license.dat file on the server machine is located in:

 $MATLABROOT/etc ($MATLAB\flexlm for releases prior to R2010b on Windows)

(where $MATLAB is the MATLAB installation directory)

3) The TCP port number used to communicate with the license server is already being used by another application.

For more information on finding an open port, see the Related Solution listed below .

Best Answer

Related Solutions

MATLAB: Do I receive a “File not found” error message in the license manager log file after starting the network license manager

MATLAB: Do I receive License Manager Error -3

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