The TCP/IP port number is listed at the end of the SERVER line in your license file. We set the default port number to 27005 for two reasons:
1. To reduce port number conflict with other software vendors.
2. To allow you to set the <port>@<host> argument with the ESRI_LICENSE_FILE variable, thereby permitting you to share licenses across all supported architectures. Refer to the 'Advanced License Manager' section for more details on TCP/IP or <port>@<host>.