What to do if Kaspersky notifies about untrusted certificate or connection not protected

[Danila T.]

The product may notify you of a problem with the certificate while opening the website.

This may be because the root certificate DST Root CA X3 was expired. So users on different devices (Windows, macOS, Android, iOS), mostly on older versions, can encounter sites access issue.

 

Workaround: 

Install latest OS updates, browser updates.

 

More info:

https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/