Update your Matlab license file
Effective 12/12/2014, IMSS retired the long-running Matlab triad license servers. If you are using a network installation of Matlab, please update your license file. This will ensure that your Matlab network installation accesses the new replacement license server. For instructions on how to obtain and update this license file, click here.
NOTE: Standalone installations do not need license files updated since they do not require network access to run. However, if your standalone installation displays a notice that the license has expired, you will need to renew your license for another year. To renew your license, please follow the instructions located at http://imss.caltech.edu/software/matlab-license-renewal-instructions.