Cert. issued to *.btrll.com by Cisco Umbrella popping in IE 11 that it cannot be verified to a trusted certification authority

[tropolis_group]

Hi:

I have some users that like to use IE (ver. 11).  Often when browsing ad supported sites like yahoo.com they're receiving a pop-up that a cert. issued to *.btrll.com by Cisco Umbrella cannot be verified to a trusted certification authority.  They can view cert. but then no option to install cert.  They can simply select Yes to continue to the site each time but it's annoying.  How to fix?

Thank you!
Bob H.

[rotblitz]

The KB is your friend: https://support.opendns.com/hc/en-us/articles/227988787