The configuration file includes a port setting, WEBSERVER_PORT, for the http server used for viewing License Statistics output. This setting defaults to port 80. You should check the log file to ensure that the port is available for your site, and change this setting if needed.
For Linux, you can use port 80 only if you have root privileges, because ports with numbers lower than 1024 cannot be bound without root privileges. This is a security precaution in most kernels. If you do not have root privileges, use a port with a number higher than 1024.