Install FileMaker Server components behind the firewall
FileMaker Server contains up to three components:
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Database Server
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Web Publishing Engine
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Web Server Module
You deploy these components on the primary machine and can add more Web Publishing Engines and Web Server Modules on secondary machines. You can control where each machine is in relation to your firewall. For example, you can choose to place all components behind the firewall to restrict access to the LAN network. If you place any machines in your deployment behind the firewall, you must open the ports used by FileMaker WebDirect in the firewall to make FileMaker WebDirect available over the internet. See Ports used by FileMaker Server in the Knowledge Base.
Important To enhance the security of your custom app, especially over the internet, use a firewall on the public side of a FileMaker Server deployment, and use SSL for the web server. See Set up SSL encryption.