Li-Fan Chen says to YSITD
Attempting to renew cert (___) from /usr/local/etc/letsencrypt/renewal/___.conf produced an unexpected error: Problem binding to port 80: Could not bind to IPv4 or IPv6.. Skipping. All renewal attempts failed. The following certs could not be renewed: /usr/local/etc/letsencrypt/live/___/fullchain.pem (failure)