On October 22nd, at 7:41 p.m. Eastern, sites hosted by Yext Pages became partially unavailable. During this time, some entity locator requests and individual entity pages returned an error. At 7:50 p.m. Eastern, Yext engineers removed the failing infrastructure and restored service to normal.
A DDoS (Distributed Denial of Service) attack against Amazon Web Services’s DNS service, Route 53, caused widespread DNS resolution errors in one of our serving regions. Rerouting traffic away from the affected regions restored services. More details regarding this attack are available at https://twitter.com/AWSSupport/status/1186735657387003904 and https://www.theregister.co.uk/2019/10/22/aws_dns_ddos/.
We plan to improve our recovery mechanisms to more quickly detect region specific outages at Amazon Web Services and to automatically fail over to our other regions.