dice@armitage:~ % fetch -6 http://forums.freebsd.org
fetch: http://forums.freebsd.org: Host is down
dice@armitage:~ % fetch -4 http://forums.freebsd.org
forums.freebsd.org 100% of 61 kB 332 kBps 00m00s
There's indeed an issue with IPv6. This is already reported to the admins.
...
For Firefox there's a quick solution, in about:config, search for network.dns.ipv4OnlyDomains and set it to forums.freebsd.org. That will force Firefox to always use IPv4 for the forums and remove the annoying time-out.
PING forums.freebsd.org(2607:fc50:1:c600:216:3eff:fe15:195 (2607:fc50:1:c600:216:3eff:fe15:195)) 56 data bytes
64 bytes from 2607:fc50:1:c600:216:3eff:fe15:195 (2607:fc50:1:c600:216:3eff:fe15:195): icmp_seq=1 ttl=53 time=93.5 ms
64 bytes from 2607:fc50:1:c600:216:3eff:fe15:195 (2607:fc50:1:c600:216:3eff:fe15:195): icmp_seq=2 ttl=53 time=112 ms
64 bytes from 2607:fc50:1:c600:216:3eff:fe15:195 (2607:fc50:1:c600:216:3eff:fe15:195): icmp_seq=3 ttl=53 time=98.8 ms
64 bytes from 2607:fc50:1:c600:216:3eff:fe15:195 (2607:fc50:1:c600:216:3eff:fe15:195): icmp_seq=4 ttl=53 time=95.6 ms
traceroute to forums.freebsd.org (2607:fc50:1:c600:216:3eff:fe15:195), 30 hops max, 80 byte packets
****
5 10ge7-6.core1.par2.he.net (2001:470:0:1b0::2) 50.694 ms 50.070 ms 50.554 ms
6 100ge14-1.core1.nyc4.he.net (2001:470:0:33b::1) 96.194 ms 84.669 ms 84.637 ms
7 100ge8-2.core1.ash1.he.net (2001:470:0:299::1) 86.882 ms 94.181 ms 94.036 ms
8 eqix-dc5.inforelay.com (2001:504:0:2:0:3:3597:1) 89.681 ms 89.969 ms 89.586 ms
9 2607:f108:0:a::22 (2607:f108:0:a::22) 89.857 ms 89.439 ms 89.843 ms
10 2607:fc50:0:12::1 (2607:fc50:0:12::1) 95.559 ms 95.971 ms 95.521 ms
11 2607:fc50:0:2::2 (2607:fc50:0:2::2) 95.827 ms 95.826 ms 93.218 ms
12 2607:fc50:1:c600:216:3eff:fe15:195 (2607:fc50:1:c600:216:3eff:fe15:195) 92.973 ms 92.989 ms 96.299 ms