Bind conf on Ubuntu

Right now I have Ubuntu 16.04, but it was the same with 14.04, every time I install virtualmin, the named.conf.options is like that:

listen-on-v6 {
listen-on {;

Which doesn’t work, I have to replace the ::1 and by “any”. I know my server provider by default they have their own kernel (you need to say if you want the default kernel), so maybe they changed other few things, but as for my smtp issue, I know how to fix it now, just wondering if it was an issue from my host, or a more general thing.