MATLAB Answers

Why do I receive License Manager Error -4?

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When I try to start MATLAB or use a toolbox, I receive the following error:
License Manager Error -4
Maximum number of users for MATLAB reached. Try again later
What does this error mean and how can I resolve it?

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 6 Dec 2019
"License Manager Error -4" indicates that all licenses are currently in use.
This means that all of the keys for a particular product have been checked out from your license server.
You will not be able to access a license for the product until another user has returned the license back to the pool.
For information about the current licenses in use you can check with your License Administrator.
Your License Administrator can check the usage of licenses by following the instructions below.
Windows:
1) Launch LMTOOLS, located within the $MATLAB\etc\win{32|64} ($MATLAB\flexlm for releases prior to 2010b). If lmtools.exe is not in that folder, see the related solution "Why are necessary license manager scripts missing from my license manager directory?" below.
2) Click the "Perform Status Enquiry" button on the SERVER STATUS tab to get a full report of the current license usage.
For Unix/Linux/Mac License Manager:
1) Open a terminal Window. For Mac OS X, use the Terminal application located in the Applications/Utilities directory.
2) In the terminal, change directories to the $MATLAB/etc directory. For example:
Linux
____
cd /usr/local/MATLAB_R2010b/etc
Mac OS X
______
cd /Applications/MATLAB_R2010b.app/etc
3) Run the following command to get the usage information
./lmstat -a -c license.dat
An example output from LMTOOLS or lmstat is located below:
--------
Status
--------
Flexible License Manager status on Mon 9/28/2009 15:35
[Detecting lmgrd processes...]
License server status: 27000@license1
License file(s) on license1: C:\Program Files\MATLAB\R2009b\flexlm\license.dat:
license1: license server UP (MASTER) v11.6
Vendor daemon status (on license1):
MLM: UP v11.6
Feature usage info:
Users of MATLAB: (Total of 2 licenses issued; Total of 2 licenses in use)
"MATLAB" v22, vendor: MLM
nodelocked license, locked to "ID=123456"
joesmith joe-pc joe-pc (v22) (joe-pc/27000 102), start Mon 9/28 15:37
janedoe jane-pc jane-pc (v22) (jane-pc/27000 101) start Tues 9/29 08:26
In this example, a license would not be available until either Joe or Jane closes MATLAB to return the license.

  3 Comments

Jerry Fausz
Jerry Fausz on 26 Feb 2015
But why do I get this error even when 'lmstat' indicates there are many licenses available?
Shawn Lyons
Shawn Lyons on 1 Apr 2015
@Jerry Fausz
It is possible that your MATLAB is reaching out to a different server than what you are entering into the lmstat command, if there are multiple license servers at your organization. The server hostname is editable in the network.lic file inside the 'licenses' folder of your MATLAB installation. Open that file in a rich text editor, and confirm that it is listing the same server that you are contacting with the lmstat command.
If you are unable to resolve the problem, please contact MathWorks support for assistance.
-Shawn
MathWorks Support
Deepak Rathore
Deepak Rathore on 30 Jan 2019
Hi I am Facing same problem when I follow the solution given above, I got the following:
Error getting status: Cannot find license file.
The license files (or license server system network addresses) attempted are
listed below. Use LM_LICENSE_FILE to use a different license file,
or contact your software provider for a license file.

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More Answers (5)

Loic Houde
Loic Houde on 10 Feb 2017
Hello, who can ne explain me that only 2/5 licenses are used and no more instance of matlab can be launch.
thanks,
#./lmstat -a -c license.dat
Users of MATLAB: (Total of 5 licenses issued; Total of 2 licenses in use)
"MATLAB" v34, vendor: MLM, expiry: 01-jan-0000
floating license
----------------------------------- # matlab MATLAB is selecting SOFTWARE OPENGL rendering. License checkout failed. License Manager Error -4 Maximum number of users for MATLAB reached. Try again later.

  0 Comments

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Nelson Nwaogu
Nelson Nwaogu on 9 Sep 2015
why am i getting this message while i purchased a licence?

  1 Comment

Scott
Scott on 2 May 2016
Hi Nelson,
Typically you'd see this error on a license shared by a company or school, not on a license you purchased individually. Please contact MathWorks support if you're seeing this error in relation to a license you've purchased.
-Scott
MathWorks Installation & Licensing Support

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Seyedmajid azimi
Seyedmajid azimi on 16 Jan 2016
Edited: MathWorks Support Team alrededor de 12 horas ago
Hi,
in my machine in the path below there is not lmstat! cd /usr/local/MATLAB_R2010b/etc
/usr/lib/matlab-8.6/etc$ ls glnxa64 LicenseAdministration.pdf
/usr/lib/matlab-8.6/etc/glnxa64$ ls lmgrd lmutil MLM
what is the problem? I'm faced with a following error which it reffered to this link.
fast_rcnn startup done License checkout failed. License Manager Error -4 Maximum number of users for Distrib_Computing_Toolbox reached. Try again later. To see a list of current users use the lmstat utility or contact your License Administrator.
Diagnostic Information: Feature: Distrib_Computing_Toolbox License path: /home/azimi/.matlab/R2015b_licenses:/usr/lib/matlab-8.6/licenses/license.dat:/usr/lib/matlab-8.6/licenses/*.lic Licensing error: -4,132. Error using gpuDevice (line 26) The GPU functionality requires a Parallel Computing Toolbox license.
Error in auto_select_gpu (line 15) g = gpuDevice(i);
Error in script_faster_rcnn_demo (line 9) opts.gpu_id = auto_select_gpu;

  2 Comments

Scott Isabelle
Scott Isabelle on 30 Nov 2018
The same problem: no lmstat in /Applications/MATLAB_R2010b.app/etc on Mac, macOS 10.12.6
There is lmutil in /Applications/MATLAB_R2010b.app/etc/maci64
./lmutil lmstat -c <licensefile> should work, but where is license.dat stored?
Kyle Perry
Kyle Perry on 12 Dec 2018
Hello,
If you are still receiving an issue running then please contact our support team so we can help find out the cuase of the issue. I have attached a link below that contains all the information for the license manager commands and another that contains the link to our support team.

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Jennifer Dhont
Jennifer Dhont on 10 Aug 2017
Edited: MathWorks Support Team alrededor de 12 horas ago
Hi,
I get the same error:
License checkout failed. License Manager Error -4 Maximum number of users for MATLAB reached. Try again later.
Diagnostic Information: Feature: MATLAB License path: Licensing error: -4,0.
But I am using a Free Matlab Trial, got the license id when asking for a trial and I am the only user. The trial worked perfectly for a week, installed last week so 30 days are not over yet.
Can anyone help?? Thanks!
Jennifer

  1 Comment

Kyle Perry
Kyle Perry on 28 Aug 2017
Hi Jennifer,
This usually means that you most likely have a network license file on your computer that MATLAB is detecting. Please contact us and we can help resolve the issue.
https://www.mathworks.com/support/contact_us/

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Paz dosa
Paz dosa on 22 Mar 2018
I get the same error. In my case lmstat -a shows: ... Users of MATLAB: (Total of 31 licenses issued; Total of 13 licenses in use) ...
Which seems to indicate that there are plenty of available licenses. The license servers used are correct. Any idea what to do next?

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