The driver enables the software communication to the license. This communication is done via broadcast through a specific port (port 1947), which must be open all the way from the client to the server. In the case of local licenses, this is rarely an issue as this port will usually be opened during the driver installation, but in the case of network license and very restrictive IT environments, it may be necessary to set up exceptions to enable communications through that port for the licensing system on any firewall that might stand between the software and the license.  Typically this is both a windows firewall as well as other software or hardware institutional firewalls.  This is especially important if the clients reside on a different subnet from the server. The topic of port exceptions has been widely covered elsewhere and is usually managed by IT management teams. If you need to create or check these exceptions yourself, a good starting point can be found here.  If you need to test whether or not port 1947 is open, you can do that using the method found here.  Please also keep in mind that activations or updates of your license will require internet access.  If none can be provided, then you will need to perform an offline activation.