SOPHOS XG BLOCK VPN EXTENSION

Hi guys ,

I have a Firewall XG 135 with full guard licence , run with the version 17.5.8  .

I recently detected that there is some user's use a vpn extension in google chroom  like zenmate , freevpn to bayepasse my firewall  .

My question is how to block any extension in sophos xg , I followed the kb :https://community.sophos.com/kb/en-us/123619#Scenario

but the user can be connect to a vpn extension .

there is any help please ???

wath i can do to fix this .

thank you for your help ,

cordilly