Im new to your app. Looks very promising

I try to figure out how "Connect on Demand" works.
I would like to disconnect after a certain time of inactivity.
Under Global Options / VPN Options i configured "DISCONNECT WHEN VPN IS INACTIVE" with 30 sec + 400 Bytes
With this Settings it disconnects the vpn after 30 seconds.
But all traffic is blocked after the disconnect. I couldn't reach anything else.
What could be the problem or misconfiguration with this behavier?
Thx