To enable the OpenConnect VPN Client, proceed as follows:
Ensure that the settings under System > Update > Firmware Update are correct. The Server Path must point to the firmware version that is currently installed. This is required because the software package for the OpenConnect VPN client must be downloaded in order to deploy the feature.
Go to System > Firmware Customization > Features and activate VPN OpenConnect (Limited support - functionality "as is", see product documentation for details).
Confirm the warning dialog with Ok.
Click Ok in the main window.
Reboot the thin client.
On reboot, the client downloads and installs the software package for the OpenConnect VPN Client feature.