04:08 UTC | 21:08 PT
Performance issues with PODs 5,6 and 9 have now been resolved.
03:47 UTC | 20:47 PT
We are seeing improvements in performance on PODs 5,6 and 9. We are monitoring closely.
03:04 UTC | 20:04 PT
We are experiencing performance issues on Pods 5,6 and 9. We are investigating.
The Zendesk team responded to alerts and reports of performance-related issues in our East Coast data center, specifically Pod 6, which later became recognized as site-wide performance degradation and service unavailability for pods 5, 6, and 9. Upon further investigation, our network operations team identified the DoS nature of the incident and immediately began to implement our DDoS mitigation capabilities. During the initial response, it was not clear that the source of the problem was a DoS or DDoS due to the nature of the attack. Our DDoS mitigation was implemented at the same time that the attack subsided on its own.
Improvements are being made to our mitigation tool to help identify and mitigate both DDoS and DoS attacks faster in the future.
FOR MORE INFORMATION
For current system status information about your Zendesk, check out our system status page. During an incident, you can also receive status updates by following @ZendeskOps on Twitter. The summary of our post-mortem investigation is usually posted here a few days after the incident has ended. If you have additional questions about this incident, please log a ticket with us.