The fact that the name "switchads" is mentioned suggests that the web site you are looking at is linking to another site (switchads) to display adverts, and there is a problem with that other site.
There is a bit about SwitchAds here but it is from 2010 so maybe they have gone bankrupt but the web site you are looking at still tries to link to them, hence the message.
https://www.adswiki.net/6939/switchads#.W-Pub9X7SUk
More on your Kaspersky message here
https://www.thewindowsclub.com/cannot-guarantee-authenticity-of-the-domain
Note in Google you can search for whole sentences rather than single words.
So I searched for "Kaspersky Cannot guarantee the authenticity of the domain to which encrypted connection is established" and found quite a few hits.