An application using Intel® Software License Manager rechecks the license server for the license periodically. So, if the network connection is lost, the application should not be able to run because the license checkout would fail.
Intel® Software License Manager Users Guide can be found at https://software.intel.com/en-us/articles/license-manager-for-flexlm-users-guide
Intel Software License Manager Getting Started Tutorial https://software.intel.com/en-us/articles/intel-software-license-manager-getting-started-tutorial