Gwyneth Butera
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Gurobi Staff
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Articles
Recent activity by Gwyneth Butera-
How do I start a token server?
Important note: Most Gurobi licenses do not use the token server. You should only follow these instructions if you are setting up a floating license. If you are not sure whether you need to start a...
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How do I set parameters in Gurobi?
When you want to change the values of Gurobi parameters, you have several options. Setting parametersFrom the Python API You have several options to set parameters in the Python interface. Here ar...
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How do I update my token server to a newer version?
If you would like to upgrade to the newest version of Gurobi Optimizer, please ensure that you have also updated your token server to the latest version.To upgrade the token server: Stop the Gurobi...
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How do I automatically start the token server on Linux?
Unlike Gurobi's Compute Server, Gurobi's Token Server cannot be installed as a service. This means you manually have to tell your operating system to launch the token server. There are a few differ...
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How do I resolve an "Error 10009: Unable to open Gurobi license file"?
The errorsUnable to open Gurobi license file 'C:\gurobi\gurobi.lic' Unable to open Gurobi license file '/Library/gurobi1302/gurobi.licare most likely caused by Gurobi environment variables that are...
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How do I set up a Named-User or Single-Machine or Single-Use or Unlimited Use-Unlimited User license?
To obtain a Gurobi license key for your computer, you'll need to run the grbgetkey command on your machine to retrieve your Gurobi license key from the Gurobi User Portal. Note that the machine mus...
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How do I resolve an "ERROR 405" when running grbgetkey?
If grbgetkey produces a message that looks like this:info : grbgetkey version 13.0.2, build v13.0.2rc1 info : Contacting Gurobi license server... error : ERROR 405: Cannot reinstall license 99999...
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How do I resolve the error "No key code entered"?
The interactive shell was removed entirely in version 13, which was released in November 2025.When launching the Gurobi Interactive shell via gurobi.sh or a shortcut to gurobi.bat, you will be prom...
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How do I set up and use a floating token server license?
When using a floating token server license, a program that calls Gurobi Optimizer must obtain a token from a Gurobi token server before it can solve an optimization model.Note: If you are setting u...
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How do I retrieve an Academic Named-User license?
To obtain a Named-User Gurobi license key file for your computer, you'll need to run the grbgetkey command on your machine to retrieve your Gurobi license key file from the Gurobi User Portal.The e...