Frontier IPv6 website unavailable

When visiting using an ipv6 tunnel from HE I am getting
the following result:

Service Unavailable
A quick poll of my peers without ipv6 shows the site rendering. It looks
like this is limited just to the IPv6 side.

Wget shows that it flops back and forth between 200 and 503. My guess is
that the v6 address is on a load-balancer and that one of the two web
servers is down.