I wasn’t sure of the best way to contact somebody about this, but the certificate on rt-wiki.bestpractical.com seems to have expired yesterday. 
Thanks for letting us know, some others reported it as well. We got a new cert deployed yesterday, so all should be good now. Let us know if you’re seeing any different.
No worries, I suspect we’ve all had that happen at some point or another. Would there have been a better place to report this?
This is OK, or you can always send email to us at contact@ or sales@ and someone will see it.
Great, thanks! (Now looking for the “resolve” button.)