Hex outage, 20 August 2025
Some users are experiencing issues accessing Hex projects
- Started
- Resolved
- 20 Aug 2025, 18:26 UTC (after 1 h 26 min)
- Impact
- Critical
- Affected
- Main site
Last update from Hex
After fully analyzing the timeline of events, **we've confirmed that the root cause was a cascading failure triggered by the combination of a feature flag, deployment timing during peak traffic, and an inefficiency in our database connection management**. The issue began August 19 at 4:03 PM PDT, when a feature flag was updated to have clients query the server more frequently to eliminate a rare display issue in the client. It escalated August 20 at 10:00 AM PDT when we did a production deployment during peak traffic to add necessary support for a new feature release. This combination created a thundering herd problem where client reconnection attempts exponentially increased system pressure...
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