![]() We found that they were coming from all around the world. The malicious traffic spikes did not originate from a single region.At this stage in our investigation, we believe that all three traffic spikes were malicious HTTPS flood attacks. The first two spikes were successfully absorbed due the platform protection mechanisms, however the ones that were initiated during the third spike did not fully mitigate the unexpected increase due to the nature of the traffic pattern (different from the first two spikes).A third spike that occurred between 16:10 to 16:44 caused a subset of environments managing this traffic to go offline. The first two spikes for this domain occurred at 15:15 UTC and 16:00 UTC on 07 of September, 2022 and were fully mitigated by AFD platform.It is because of this design that customers and end users don’t experience any issues in case of localized or regionalized impact. In addition to that, we also have protections built in every single node to protect our platform from unusual traffic spikes corresponding to each domain hosted on AFD.īetween 15:15 and 16:44 UTC we observed 3 unusual traffic spikes for one of the domains hosted on AFD. When there is a failure in any of our edge sites or an edge site becomes overloaded, traffic is automatically moved to other healthy edge sites in other regions where we have fallback capacity. ![]() The AFD platform automatically balances traffic across our global network of edge sites. This could also have impacted customers’ ability to access other Azure services that leverage AFD, in particular the Azure management portal and Azure Content Delivery Network (CDN). ![]() Some customers may have seen higher failures if their traffic was concentrated in the edges or regions with higher impact. At its peak, this impacted approximately 25% of the traffic, and on average, 10% of the traffic that traverses through the AFD service during the impact window. Post Incident Review (PIR) - Azure Front Door - Connectivity Issues (Tracking ID YV8C-DT0)īetween 16:10 and 19:55 UTC on, a subset of customers using Azure Front Door (AFD) experienced intermittent availability drops, connection timeouts and increased latency. ![]()
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