Down for me via Cogent since 8:40 am Central. IPv4 access is just fine. IPv6 access from another host via NTT is fine, too, so I suspect a Cogent issue. nagios:# wget -6 www.facebook.com --2013-07-03 08:59:45-- http://www.facebook.com/ Resolving www.facebook.com... 2a03:2880:2030:2f07:face:b00c:0:1 Connecting to www.facebook.com|2a03:2880:2030:2f07:face:b00c:0:1|:80... failed: Connection timed out. Retrying. --2013-07-03 09:00:07-- (try: 2) http://www.facebook.com/ Connecting to www.facebook.com|2a03:2880:2030:2f07:face:b00c:0:1|:80... ^C nagios:# tcptraceroute6 www.facebook.com traceroute to www.facebook.com (2a03:2880:2030:2f07:face:b00c:0:1) from 2607:fe28:0:1000::5, port 80, from port 54063, 30 hops max, 60 bytes packets 1 router-core.mtcnet.net (2607:fe28:0:1000::1) 0.267 ms 0.209 ms 0.268 ms 2 sxct.movl.mtcnet.net (2607:fe28:11:1002::194) 0.221 ms 0.138 ms 0.107 ms 3 v6-premier.movl-mlx.fbnt.netins.net (2001:5f8:7f0a:1::1) 1.922 ms 1.924 ms 1.912 ms 4 v6-ins-kb1-te-13-2-220.kmrr.netins.net (2001:5f8:2:2::1) 6.335 ms 6.312 ms 6.348 ms 5 v6-ins-kc1-te-9-2.kmrr.netins.net (2001:5f8::10:1) 6.403 ms 6.360 ms 6.339 ms 6 v6-ins-wc2-po20.wdmn.netins.net (2001:5f8::15:2) 7.848 ms 7.867 ms 7.873 ms 7 v6-ins-wc1-po21.wdmn.netins.net (2001:5f8::24:1) 7.905 ms 7.888 ms 7.878 ms 8 2001:550:2:24::1 (2001:550:2:24::1) 11.757 ms 8.207 ms 8.164 ms 9 2001:550:3::19e (2001:550:3::19e) 15.493 ms 15.464 ms 15.464 ms 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * * nagios:#