How do I release or return a toolbox license key back to the pool of available keys without restarting the network license manager or exiting MATLAB?
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MathWorks Support Team on 27 Jun 2009
I would like to know if it is possible to return the toolbox key back to the network license manager without closing/exiting the current MATLAB session.
I see the following message when I start MATLAB, or when I attempt to run a function from a toolbox even though no one else is using the license key:
License Manager Error -4
Maximum number of users for "..." reached. Try again later.
MathWorks Support Team on 27 Feb 2019
Toolbox license keys cannot be returned without exiting MATLAB. The Toolbox license keys get checked back in when the main MATLAB session is ended. Each time MATLAB is launched, a MATLAB license key is checked out from the pool of available licenses. Likewise, if a function from a MATLAB toolbox is called, a license key for that toolbox is checked out.
If you are having an issue returning license keys after closing the MATLAB session, contact the Installation and Licensing Team by creating a Service Request here:
More Answers (1)
Jonathan on 17 Oct 2016
Perhaps there is very little incentive for the developers to "make efficient use of the resources available". The business preference would likely be for the end user to buy more licenses.
In this day and age, it sure would be nice to check licenses out directly from MathWorks servers and pay monthly on a per usage basis. Does such a business model exist?