Dyndns update fails

Why not yes … Or you can choose to wait until we fix the issue …

You can disable it doing this :

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

And if you want to reenable it someday you can just put 0 instead of 1