To secure the license management environment and allow you to implement a firewall, you can lock the ARCGIS daemon to a specific port. It is dynamic, meaning that it can listen on any available port. The ARCGIS daemon, on the second line of the file, is not confined to a particular port range. By default, the lmgrd daemon is set to port 27000. The problem is caused by the firewall often closing or blocking access to the ports the license manager uses to communicate.
Because the license manager uses the TCP/IP protocols, implementing such a firewall can pose problems between the license manager server and the clients connecting to it. Many of today's networks use a firewall for enhanced security from outside threats.
