1- Right click on the network icon > Open Network and Internet Settings
2- Click on Change connection properties > Private
3. Open up Advanced Firewall settings. You can search for this in the start menu
4. Backup your current firewall settings. Click on Action > Export Policies. Pick a location and save the file
5. Action > Restore Default Policy > Yes
6. Click on Windows Defender/Firewall Properties
7. Under Domain Profile, set Inbound and Outbound to Block (like below)
- If you ever get a firewall popup to add a program, make sure to uncheck “Private networks” and only have “Public networks” checked before clicking Allow access; If you fail to monitor this, the kill switch will be pointless.
- You can use VISCOSITY instead of OpenVPN as well. It has kill switch feature built in.