03/18/2010 05:12 am ET | Updated May 25, 2011

Amazon DOWN After DDoS Attack Cripples Amazon, Wal-Mart, Others

If you've been doing some last minute Amazon holiday shopping on Wednesday evening, you've probably noticed that Amazon's web site was sluggish and, at times, completely down. The same fate greeted Wal-Mart, Expedia, and a number of smaller sites. The reason? A severe DDoS (Distributed Denial of Service) attack on the servers of Neustar, the company that offers DNS services to many major companies under the name UltraDNS.