Your Let’s Encrypt client used ACME TLS-SNI-01 domain validation to issue

Are you seeing this message about your server ?

Action may be required to prevent your Let's Encrypt certificate renewals
from breaking.

If you already received a similar e-mail, this one contains updated
information.

Your Let's Encrypt client used ACME TLS-SNI-01 domain validation to issue
a certificate in the past 60 days

This is an issue caused by the certbot binary being out of date. We are seeing it on a few systems, and it seems there is an easy fix for it!

Debian stretch:
Add backports by adding a line into /etc/apt/sources.list like this
deb http://ftp.debian.org/debian stretch-backports

Then apt-get update ; apt-get install certbot python-certbot-apache -t stretch-backports

Anything else you will need to download the binary for as per https://certbot.eff.org/

If you get stuck doing any of this, pop in a support ticket and we can help out.

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