"Kill Switch" On Android version 8.0 or higher works just like a system-wide killswitch, blocking any Internet access while not connected to VPN services. Most devices (depends on the ROM) that have Android version 7.0 or higher have "Always-on VPN" functionality which prevents leaks in case of a sudden VPN connection drop .
System wide VPN connection - Microsoft Community System wide VPN connection I have a vpn connection to a windows server (L2tp), that works ok. But i have several user accounts on this windows 10 professional computer, and each of the users needs to be connected to the same vpn server How to Set Up and Use a VPN | PCMag Mar 16, 2020 Windows.Networking.Vpn Namespace - Windows UWP
ASDM Book 3: Cisco ASA Series VPN ASDM Configuration Guide
Sep 28, 2019 VPN - IBM Use the VPN settings to configure traditional system-wide VPNs based on L2TP, PPTP, and IPSec. These settings do not apply to per-app VPN settings. The following table describes the connection parameters that are required to enforce a secure VPN connection on macOS devices: OpenVPN / [Openvpn-devel] NOTE: unable to redirect default
Sep 10, 2018
Mar 16, 2020 Set up Citrix SSO for iOS users Device level VPN profiles are used to set up a system wide VPN. Traffic from all apps and services is tunneled to Citrix Gateway based on the VPN policies (such as Full-tunnel, Split-tunnel, Reverse Split tunnel) defined in Citrix ADC. To configure a device level VPN on Citrix Endpoint Management. Set up Citrix SSO for macOS users Device level VPN profiles are used to set up a system wide VPN. Traffic from all apps and services is tunneled to Citrix Gateway based on the VPN policies (such as Full-tunnel, Split-tunnel, Reverse Split tunnel) defined in Citrix ADC. To configure a device level VPN on Citrix Endpoint Management.