FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Description This article describes the option in the SSL VPN that allows to set the source-address as a negate (ie: allow connects from every IP except the ones specified). Solution This is configurable from CLI.
# config vpn ssl settings
set source-address-negate enable
set source-address "the address object you've configured to block"