Looks OK to me in firefox, and Qualys gives it an A+

https://www.ssllabs.com/ssltest/analyze.html?d=emacssurvey.o...

Looking at CenturtyLink/Level3 on a business line in Washington looks fine too.

Hmm. I have CenturyLink as well. Maybe the cert was serving its purpose and notifying me that the connection's been tampered with? I'll check again when I'm on my desktop (instead of mobile).

Yep, both Firefox and Chrome report that the cert is bad on my CenturyLink internet.