Let's Encrypt - "acme-v02" connection with IPv4 only

This shell script forces acme-v02.api.letsencrypt.org to resolve via IPv4 on servers with IPv6 interfaces that are enabled but dysfunctional in any number of ways.

It works by updating an entry in the server’s /etc/hosts file on a schedule, to the latest IPv4 address found for that domain. This is necessary because the IP address rotates regularly.

Download the shell script

wget -O /usr/local/sbin/forceleipv4.sh "https://pastebin.com/raw/ETsD9D9W"
chmod 700 /usr/local/sbin/forceleipv4.sh

Installing a cron task

echo '0 * * * * root /usr/local/sbin/forceleipv4.sh' > /etc/cron.d/forceleipv4

Forcefully update LE IPv4


The output of the hosts file

cat /etc/hosts

That's it.

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