Forticlient IPSec VPN remains connected

[ATosI5]

Hello,

I am experiencing a strange issue with FortiClient VPN 7.4 and FortiGate 7.6

I've configured an IPSec Dialup server on specific public IP using certificates + xauth + no split tunnel (using aggressive mode).

Connection is fine and works as expected, but when I click on Disconnect (on client side), I got the disconnection on client but on fortigate connection is still shown as ACTIVE until dpd kill it. I checked on  client side using wireshark but cannot see any packet going out when clicking on disconnect.

Is this the right behavious or I missed something?

Thanks