Explicit Proxy allows traffic only from specific IP addresses to authenticate using the X-Authenticated-User (XAU) protocol. Create an address object then Edit the Trusted Source Address configuration and add the address object to specify the IP addresses where XAU is allowed for authentication for explicit proxy. For more information, refer to Secure Mobile Users with an Explicit Proxy.
Add a trusted source address. The X-Authenticated-User (XAU) contained in incoming requests from these source addresses are trusted for the Explicit Proxy.