Steps to reproduce 1. setup IPv6, /usr/ports/net/freenet6 is the easiest way 2. set sysctl net.inet6.ip6.v6only=1 3. load mozilla 4. attempt to browse an IPv4 only site (most anything) 5. see connection refused message 6. attempt to browse an IPv6 site (www.6bone.net) 7. see that it works Expected behavior: Mozilla connects properly via IPv4 Workaround: set net.inet6.ip6.v6only=0 via sysctl or set ipv6_ipv4mapping="YES" in /etc/rc.conf ---- Recently, ipv6_ipv4mapping was changed from YES to NO in -CURRENT, I do not know if this has or will be MFC'd to -STABLE. Basically, this means that there is no ::ffff:w.x.y.z address for the local machine. w3m with IPv6 support works as expected with no ipv4 mapping.

Please search for other bugs w/ "IPV6" in summary + same OS as what you got.

*** This bug has been marked as a duplicate of 86917 ***