Place FortiWeb in front of FortiADC: This configuration change places FortiWeb between the client and FortiADC, so that FortiWeb can directly inspect and protect the incoming traffic before FortiADC applies SNAT (Source Network Address Translation). By placing FortiWeb in front, it will have access to the real client IP addresses, and it will be able to properly identify and handle attack traffic without blocking legitimate client traffic.

Enable and configure the Use X-Forwarded-For setting on FortiWeb: This setting allows FortiWeb to extract the original client IP address from the X-Forwarded-For header in the HTTP request, which is inserted by FortiADC when performing SNAT. With this setting enabled, FortiWeb will be able to block traffic based on the original client IP address rather than the SNATed IP address (192.0.2.1), preserving the accuracy of the security measures.