Creating a token server client license

The purpose of a token server client license is quite simple: it tells the client where to find the Gurobi token server. You can create this file yourself (using a text editor like vim, for example). The client gurobi.lic file typically contains a single line of text:
You should of course substitute the name or IP address of your token server in the example above.

If your token server was configured to use a non-default port, you'll also need a line that provides the port number:


The client license file may also include a few optional lines. A SERVERTIMEOUT line allows you to specify the timeout (in seconds) in case the token server is unavailable. The default value is 30 seconds. If the client program is unable to contact the server for more than the specified amount of time, the client will quit with a network error.

A PASSWORD line allows you to connect to a password-protected token server (you'll need to get the password from the owner of the token server).

A more complex client token file might look like this:


We strongly recommend that you place your client gurobi.lic file in a default location for your platform (either your home directory or /opt/gurobi). Setting up a non-default location is error-prone and a frequent source of trouble. (If you still want to use a non-default location, please refer to the instructions that appeared earlier in this section).

If your client and the token server are both running on the same machine, they can share a single gurobi.lic file. You just need to add the following line to the gurobi.lic file you obtained from our website:

The token server will ignore this line, and the client will ignore everything but this line. Your other option when both client and server are running on the same machine is to create a separate gurobi.lic file for the client, and to set the GRB_LICENSE_FILE environment variable to point to this file (following the earlier instructions for using a non-default license location).

Once your client license is in place, you can test the license. If you are unable to connect to the server, you'll need to make sure the server is installed and running. Please consult the instructions for starting a token server for more information.

Try Gurobi for Free

Choose the evaluation license that fits you best, and start working with our Expert Team for technical guidance and support.

Evaluation License
Get a free, full-featured license of the Gurobi Optimizer to experience the performance, support, benchmarking and tuning services we provide as part of our product offering.
Academic License
Gurobi supports the teaching and use of optimization within academic institutions. We offer free, full-featured copies of Gurobi for use in class, and for research.
Cloud Trial

Request free trial hours, so you can see how quickly and easily a model can be solved on the cloud.