The link is http, so you're using something (perhaps HTTPS Everywhere?) which is converting it to an https link. According to the Qualys SSL tester (https://ww

The link is http, so you're using something (perhaps HTTPS Everywhere?) which is converting it to an https link. According to the Qualys SSL tester (https://www.ssllabs.com/ssltest/analyze.html?d=www.circleid.com https://www.ssllabs.com/ssltest/analyze.html?d=www.circleid....), the IPv6 server for www.circleid.com has "Certificate not valid for domain name" (and the IPv4 server gets an F grade), so you're probably either using IPv6, or using IPv4 with a browser which no longer accepts the obsolete TLS 1.0 version.