Is this my answer? If so can I change port 80 to port 81 or something else?
1.1. When running FileMaker Server in an environment that uses a firewall, configure the firewall to allow network access to ports 80, 5003, and 16000. In addition, allow access to port 443 if you are using HTTPS and allow access to port 2399 for ODBC/JDBC clients.