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Incident detail

2026-April-16 Resolved Service Incident

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  1. Resolved

    Between 02:00 and 11:15 CEST, live and automated tests on iOS 17.0 simulators were failing to start in the EU and US-West Data Center. We executed a deployment rollback, which restored services. All systems are now fully operational.

  2. Resolved

    ### Dates:

    Thursday, April 16th 2026, 00:00 UTC – 09:15 UTC

    ### What happened:

    Live and automated tests on iOS 17.0 simulators failed to start in both the EU and US-West data centers. Customers running tests on iOS 17.0 Intel-based simulators were unable to execute their tests for approximately 9 hours.

    ### Why it happened:

    A deployment introduced an incompatibility affecting iOS 17.0 on Intel-based infrastructure. The issue was not caught prior to release due to insufficient post-deployment test coverage for that specific simulator configuration.

    ### How we fixed it:

    We performed a rollback to the previous deployment, which restored full iOS 17.0 simulator functionality.

    ### What we are doing to prevent it from happening again:

    We are reviving and expanding automated post-deployment tests to cover a broader range of simulator configurations, including legacy Intel-based iOS versions, to catch incompatibilities before they reach production.