Is your site IPv6 ready?

Hostname he.net does have IPv6-addressed nameservers defined.

Hostname top-level domain (net.) does have IPv6-addressed nameservers defined.

Hostname he.net does have an IPv4 A record (216.218.236.2).

Hostname he.net does have an IPv6 AAAA record (2001:470:0:503::2).

Hostname he.net has at least one MX with AAAA record (2001:470:0:76::2).

IPv6-accessible nameservers at top-level domain (2001:500:856e::30, 2001:500:d937::30, 2001:501:b1f9::30, 2001:502:1ca1::30, 2001:502:7094::30, 2001:502:8cc::30, 2001:503:231d::2:30, 2001:503:39c1::30, 2001:503:83eb::30, 2001:503:a83e::2:30, 2001:503:d2d::30, 2001:503:d414::30, 2001:503:eea3::30) do provide glue pointing to v6-accessible nameservers for he.net (2001:470:100::2, 2001:470:200::2, 2001:470:300::2, 2001:470:400::2, 2001:470:500::2).

Successfully connected to he.net on port 80 over IPv4.

Successfully connected to he.net on port 80 over IPv6.

Could not establish connection to URL http://he.net.