It looks like the cert for answers.ros.org has expired:
NET::ERR_CERT_DATE_INVALID
Subject: answers.ros.org
Issuer: Let's Encrypt Authority X3
Expires on: Nov 4, 2017
Current date: Nov 4, 2017
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[Visit Topic](
https://discourse.ros.org/t/expired-cert-on-answers-ros-org/3113/1) or reply to this email to respond.
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