#1 By: Steve Kemp, January 23rd, 2012 13:16
From approximately 17:50 we had an outage of our resolving nameservers. We have a pair of nameservers such that each one of the pair can be taken down individually without causing any outage.
Unfortunately the configuration of our routing was such that when one host was taken down the traffic was still sent to it, which lead to a lost of DNS resolving.
This has now been fixed, and we'll ensure it doesn't happens again by updating our routing.