How to disconnect from OpenConnect VPN

[Mike Gilbert]

On Tue, Aug 22, 2023 at 10:20 AM David Nelson <dave at collaboration.cafe> wrote:
>
> Hello,
>
> First of all, thank you for your work on OpenConnect VPN.
>
> I can successfully connect to my OpenConnect server using the
> openconnect client on Ubuntu 22.04.
>
> But how can I disconnect? I don't see anything in the help obtained via
> openconnect --help
>
> Googling only informed me that I could simply kill the openconnect
> client process.
>
> Is there a more-civilized way of doing it from the command line, please?

openconnect shuts down gracefully when it receives SIGINT or SIGTERM.
This is documented in the openconnect.8 man page.

SIGNALS
       In the data phase of the connection, the following signals are handled:

       SIGINT / SIGTERM
              performs  a  clean  shutdown by logging the session off, discon‐
              necting from the gateway, and running the vpnc-script to restore
              the network configuration.

       SIGHUP disconnects from the gateway and runs the vpnc-script, but  does
              not  log the session off; this allows for reconnection later us‐
              ing --cookie.

       SIGUSR1
              writes progress message with detailed connection information and
              statistics.

       SIGUSR2
              forces an immediate disconnection and reconnection; this can  be
              used to quickly recover from LAN IP address changes.