Note that the linked site, cs.lmu.edu, has a broken IPv6 DNS record: $ dig cs.lmu.edu AAAA cs.lmu.edu. 3493 IN AAAA ::1 When lo

Note that the linked site, cs.lmu.edu, has a broken IPv6 DNS record: $ dig cs.lmu.edu AAAA cs.lmu.edu. 3493 IN AAAA ::1 When loaded on IPv6-enabled clients, you'll connect do localhost:80 instead.