Tuesday morning, around 8am, some servers of UltraDNS had serious problems. Some of their nameservers didn’t react anymore or answered very slowly. Because of this some of their customers also had serious problems. And UltraDNS does have, some important customers such as the .nu registry and Amazon.com. Besides they’re also the .biz and .us registry.
Around 8h50am Amazon.com switched servers to keep problems within the limits. The biggest issues were solved around 10am Tuesday morning.
However no one really knows what just happened. According to Dynect Platform, a competitor of UltraDNS, there are 2 possiblities. ‘It’s possible that UltraDNS was attacked from the outside or otherwise something went seriously wrong internally,’ says Jeremy Hitchcock, CEO of Dynect Platform.
Up until now, UltraDNS admits that something went wrong but doesn’t communicate about the difficult reach of some of their servers.