Problem binding to port 443: Could not bind to IPv4 or IPv6.. Skipping

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My domain is:
I ran this command:
sudo -H /usr/local/sbin/certbot-auto renew
It produced this output:

Processing /etc/letsencrypt/renewal/

Cert is due for renewal, auto-renewing…
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for
tls-sni-01 challenge for
Cleaning up challenges
Attempting to renew cert from /etc/letsencrypt/renewal/ produced an unexpected error: Problem binding to port 443: Could not bind to IPv4 or IPv6… Skipping.

My web server is (include version):
nginx version: nginx/1.4.6 (Ubuntu)

The operating system my web server runs on is (include version):
ubuntu 14.04

My hosting provider, if applicable, is:
Self hosted on an AWS server

I can login to a root shell on my machine (yes or no, or I don’t know):

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

shutting down nginx and then renewing and restarting nginx fixed the problem

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