Using the Apache web server in macOS
You do not need to enable the Apache web server that is installed with macOS, and you don't need to have the macOS Server application installed. The FileMaker Server installer creates its own instance of the Apache web server on both the primary and secondary machines and configures this web server to use port 80 for HTTP and port 443 for HTTPS. On the primary machine, the installer also configures its Apache web server to use port 16000 for Admin Console via HTTPS. If you have enabled the Apache web server that is already installed with macOS, the FileMaker Server installer prompts you to make the ports available.
If you use the macOS Server application to enable any HTTP services (for example, websites or a wiki), the existing Apache instance may be reenabled after FileMaker Server is installed. To ensure the Apache instance used by FileMaker Server works normally, you may need to configure any other HTTP services to use different ports from the ports that FileMaker Server uses, disable other HTTP services, or uninstall the macOS Server application.