[dns-operations] reason for outage, c.root-servers.net, 2019-08-14

[Paul Vixie]

at 2019-08-14 1700Z, a configuration change to disable connection tracking of 
DNS traffic had the harmful side effect of preventing internal synchronization 
of the root zone to all C-root anycast nodes.

at 2019-08-17 0021Z, the staleness problem was corrected, and also, the 
internal monitoring which should have detected this staleness problem was 
corrected.

this was not an attack, and all queries heard by c-root were answered.

vixie, for c-root