How to fix Attempting to renew cert from /etc/letsencrypt/renewal/example.com.conf produced an unexpected error: Problem binding to port 443: Could not bind to IPv4 or IPv6.. Skipping.

Issue: Attempting to renew cert from /etc/letsencrypt/renewal/example.com.conf produced an unexpected error: Problem binding to port 443: Could not bind to IPv4 or IPv6.. Skipping. How to fix: Just stop webserver before renew letsencrypt. sudo service nginx stop cd letsencrypt sudo ./letsencrypt-auto renew sudo service nginx start