Bocs, jegyzet magamnak.
echo QUIT | \
openssl s_client -connect freedns.afraid.org:443 2> /dev/null | \
sed '/BEGIN CERT/,/END CERT/!d' > /etc/ssl/private/freedns.afraid.org.pem
wget --secure-protocol=TLSv1 \
--ca-certificate=/etc/ssl/private/freedns.afraid.org.pem \
--read-timeout=0 --tries=10 --wait=10 -qO /dev/null \
https://freedns.afraid.org/dynamic/update.php?************************************