> The affected US‑EAST‑1 is AWS’s oldest and most heavily used hub. Regional concentration means even global apps often anchor identity, state or metadata flows there. When a regional dependency fails as was the case in this event, impacts propagate worldwide because many “global” stacks route through Virginia at some point.
> Modern apps chain together managed services like storage, queues, and serverless functions. If DNS cannot reliably resolve a critical endpoint (for example, the DynamoDB API involved here), errors cascade through upstream APIs and cause visible failures in apps users do not associate with AWS. That is precisely what Downdetector recorded across Snapchat, Roblox, Signal, Ring, HMRC, and others.
(h/t @npub1un3s...uqv2)


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Revealing the Cascading Impacts of the AWS Outage | Ookla®
Explore the global impact of the Oct 2025 AWS US-EAST-1 outage, with 17M+ reports, a DNS root cause, and clear guidance to contain future failures.

