Chapter 23 WAN Optimization, Web Cache, Explicit Proxy, and WCCP : Example network topologies : Explicit FTP proxy topologies
  
Explicit FTP proxy topologies
You can configure a FortiGate unit to be an explicit FTP proxy server for FTP users. To use the explicit web proxy, FTP users must connect to and authenticate with the explicit FTP proxy before connecting to an FTP server.
Figure 321: Explicit FTP proxy topology
You can also configure reverse explicit FTP proxy (Figure 322). In this configuration, users on the Internet connect to the explicit web proxy before connecting to an FTP server installed behind a FortiGate unit.
Figure 322: Reverse explicit FTP proxy topology