Chrome reports the following:
Your connection is not private
Attackers might be trying to steal your information from drupal.org (for example, passwords, messages, or credit cards). NET::ERR_CERT_REVOKED
drupal.org normally uses encryption to protect your information. When Google Chrome tried to connect to drupal.org this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be drupal.org, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Google Chrome stopped the connection before any data was exchanged.
You cannot visit drupal.org right now because this certificate has been revoked. Network errors and attacks are usually temporary, so this page will probably work later.
drupal.org works fine in firefox.
Tracing the certificates down I found that Apple’s keychain access seems to think that intermediate certificate used by the site (GlobalSign Organization Validation CA – SHA256 – G2) has been revoked. I have no idea if the certificate has been revoked or if just something is failing on my computer to think that the certificate is bad.
MacOS Sierra 10.12, Safari 10.0, Chrome Version 54.0.2840.59 (64-bit)