Troubleshooting Tip: Unable to set the persistence option under virtual-server when NGFW policy-mode is enabled

This article describes why the option to set 'persistence' is not displayed in the GUI or CLI under the virtual-server configuration when the NGFW mode is set to policy-mode. 

config system settings

    set ngfw-mode policy-based

end

config firewall VIP
    edit "virtual_server_001"
        set type server-load-balance
        set server-type HTTP
        set extip 172.16.50.10
        set extintf "port1"
        set ldb-method least-session
        set extport 80
        config realservers
              edit 1
                    set ip 192.168.13.10
                    set port 80
              next
        end
    end
end

FG-760-GA # config firewall vip

FG-760-GA (vip) # edit virtual_server_001

FG-760-GA (virtual_server_001) # set persistence

command parse error before 'persistence'
Command fail. Return code -61