Configure Internet Kill Switch [IKS] on Windows 8 - Knowledgebase
Apr 13, 2017
"Make sure to uninstall your antivirus firewall or any other 3rd party firewall as it may disable the IKS and in order for IKS to work make sure that windows firewall is enabled at all times"IKS Configuration.
Click on Network icon and then click on Ethernet connection / Wifi Connection
Check this switch is ON, if yes then no change is required, if no then please switch it ON. Also check firewall is On.
Internet is working fine without VPN. Now start to block Internet traffic without VPN