Pusher outage, 20 October 2025
US3 cluster - major outage
- Started
- Resolved
- 20 Oct 2025, 20:41 UTC (after 2 h 5 min)
- Impact
- Major
- Affected
- Channels REST API, Channels WebSocket client API, Channels presence channels
Last update from Pusher
## Root Cause Analysis: Redis Cluster Startup Failures - US3 Cluster **Incident Date:** October 20, 2025 **Duration:** 18:36 UTC - 20:41 UTC **Status:** Resolved ## **Summary** On October 20, 2025, customers experienced a significant outage affecting the US3 cluster. The disruption began with increased latency and 503 errors before escalating into full service downtime as Redis clusters in the US3 region failed to start successfully during an infrastructure update. Service was fully restored at 20:41 UTC after engineers identified and resolved the underlying startup issue, confirming stability across all Redis clusters. ## **Impact** Between **18:36 UTC and 20:41 UTC**, custom...
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