The FortiGate explicit web proxy
You can use the FortiGate explicit web proxy to enable explicit proxying of IPv4 and IPv6 HTTP, and HTTPS traffic one or more FortiGate interfaces. The explicit web proxy also supports proxying FTP sessions from a web browser and proxy auto-config (PAC) to provide automatic proxy configurations for explicit web proxy users. From the CLI you can also configure the explicit web proxy to support SOCKS sessions from a web browser.
The explicit web and FTP proxies can be operating at the same time on the same or on different FortiGate interfaces.
If explicit web proxy options are not visible on the web-based manager, go to System > Feature Select and turn on Explicit Proxy.
In most cases you would configure the explicit web proxy for users on a network by enabling the explicit web proxy on the FortiGate interface connected to that network. Users on the network would configure their web browsers to use a proxy server for HTTP and HTTPS, FTP, or SOCKS and set the proxy server IP address to the IP address of the FortiGate interface connected to their network. Users could also enter the PAC URL into their web browser PAC configuration to automate their web proxy configuration using a PAC file stored on the FortiGate unit.
Enabling the explicit web proxy on an interface connected to the Internet is a security risk because anyone on the Internet who finds the proxy could use it to hide their source address.
If the FortiGate unit is operating in Transparent mode, users would configure their browsers to use a proxy server with the FortiGate management IP address.
If the FortiGate unit is operating with multiple VDOMs the explicit web proxy is configured for each VDOM. The web proxy receives web browser sessions to be proxied at FortiGate interfaces with the explicit web proxy enabled. The web proxy uses FortiGate routing to route sessions through the FortiGate unit to a destination interface. Before a session leaves the exiting interface, the explicit web proxy changes the source addresses of the session packets to the IP address of the exiting interface. When the FortiGate unit is operating in Transparent mode the explicit web proxy changes the source addresses to the management IP address. You can configure the explicit web proxy to keep the original client IP address. See Preventing the explicit web proxy from changing source addresses on page 2925.
For more information about explicit web proxy sessions, see Explicit web proxy sessions and user limits on page 2930.
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