When accessing wsprnet.org, if I leave Firefox IPv6 capable the site refuses to connect. I notice that host wsprnet.org has a AAAA resource record:

wsprnet.org has address 69.164.213.205
wsprnet.org has IPv6 address 2600:3c03::f03c:91ff:fe96:829b

It pings fine:

PING6(56=40+8+8 bytes) 2001:470:1f09:12b::20 --> 2600:3c03::f03c:91ff:fe96:829b
16 bytes from 2600:3c03::f03c:91ff:fe96:829b, icmp_seq=0 hlim=56 time=105.737 ms
16 bytes from 2600:3c03::f03c:91ff:fe96:829b, icmp_seq=1 hlim=56 time=105.724 ms
16 bytes from 2600:3c03::f03c:91ff:fe96:829b, icmp_seq=2 hlim=56 time=105.182 ms

However, wsprnet's httpd doesn't seem to be bound to this address. Can this be looked at, please? It makes life very difficult for those of us on dual stack.