I'm playing a bit with the IPv6 certification from he.net and I'm an IPv6 Professional so far I'm not far away from being a Guru. I think the problem is that my secondary name server is not IPv6 capable. So I need to wait until OVH moves ns.kimsufi.com to IPv6 or I need to find another IPv6 secondary NS.

You can see my scorecard here.

EDIT: he.net provides free IPv6-capable NS for 50 domains. So I removed ns.kimsufi.com and use nsX.he.net as slaves now. So I'm a Sage now