Openvpn why no information is displayed in the log when the client is disconnected?

Question

linux

When a client connects, information is displayed in the management interface

>CLIENT:ESTABLISHED,0
>CLIENT:ENV,n_clients=1

etc.
and when you turn off nothing, how to fix it?

Answer 1

If openvpn is configured to use the UDP protocol, then it is quite difficult for the server to know that the client has died. The connection is not established and it is possible to guess that the client is no more only after some time has passed.