Kaspersky message?

A couple of times recently when logging into TBB speedtest I've received a Kaspersky message saying:
Cannot establish encrypted connection
Still seems to work OK.
Haven't noticed it anywhere else (yet).
Running Win8.1 and, usually, GoogleChrome.
How significant is this please?

Still getting this prob. Although the message insists on popping up (only with ThinkBroadband) it doesn't prevent the website loading.

Though not consistent I haven't identified a pattern yet.

Kaspersky suggest unchecking 'Scan encrypted connections' and 'Do not use proxy server'. Neither has made any difference. Going through their Protection Settings identifies 'Web anti-virus' as clearing the irritation when unchecked.

Oddly, seems to occur on IE11 but not now GoogleChrome, but I need further checks on this.

Kaspersky now request submitting their ReportMaker.

Very puzzling. Any thoughts?

Whitelist the speedtest page.

Whitelist? Sorry - don't know what that means.

Maybe this will help http://support.kaspersky.co.uk/5177

Truly weird, guys. I contacted Kaspersky about this but, in the meantime, it's disappeared.