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CircleCI: Mac jobs failing to start

Affected components: macOS Jobs

Timeline of updates

1. investigating2026-06-01 01:04 UTC

   Mac jobs are continuing to experience failures. Our infrastructure provider is continuing to report that they are experiencing a DDoS attack causing high network latency and packet loss for our Mac fleet. We are working to bring up additional capacity to restore service.

2. investigating2026-06-01 01:05 UTC

   We are continuing to investigate this issue.

3. monitoring2026-06-01 01:36 UTC

   We are seeing Mac jobs starting successfully and improved network connectivity to the Mac fleet, however our infrastructure provider is continuing to experience a DDoS attack. We will continue to monitor the recovery while bringing additional capacity to our platform.

4. monitoring2026-06-01 02:05 UTC

   Mac jobs are running successfully, and we are continuing to monitor the performance of our Mac fleet. Thank you for your patience.

5. resolved2026-06-01 03:26 UTC

   All Mac jobs are running successfully. Our infrastructure provider has confirmed that the DDoS attack has been mitigated and that services have been restored. Thank you for your patience during this incident.

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). CircleCI profile · Recent CircleCI incidents · Markdown · JSON