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Outage in Circle CI

Mac jobs failing to start

Resolved Minor
May 31, 2026 - Started 16 days ago - Lasted about 7 hours
Official incident page

Incident Report

Summary AI Generated

A network outage caused by a DDoS attack on Circle CI's infrastructure provider prevented Mac jobs (m4pro.medium and m4pro.large resource types) from starting due to high network latency and packet loss. The incident affected macOS jobs for 6.5 hours while Circle CI worked with their infrastructure provider to restore service. The issue was fully resolved after additional capacity was brought online to mitigate the network connectivity problems.

We have identified a network outage that is preventing Mac jobs from starting. This include m4pro.medium and m4pro.large resource types. We are working with our infrastructure provider to restore service. We will update this incident as we work to resolve the issue.
Components affected
Circle CI macOS Jobs

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Latest Updates ( sorted recent to last )
RESOLVED 15 days ago - at 06/01/2026 12:45AM

Mac jobs have now fully recovered.

Thank you for your patience during this incident.

MONITORING 15 days ago - at 06/01/2026 12:24AM

We are seeing Mac jobs starting successfully and improved network connectivity to the Mac fleet. We will continue to monitor the recovery.

IDENTIFIED 15 days ago - at 05/31/2026 10:38PM

Mac jobs are continuing to experience failures. Our infrastructure provider is reporting 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.

We will continue to update as more information is available.

IDENTIFIED 16 days ago - at 05/31/2026 09:24PM

We are continuing to investigate failures with Mac jobs starting due to high network latency and packet loss. Our engineers remain engaged with our infrastructure provider to restore service.

We will provide another update within the hour, or sooner if circumstances change. We thank you for your patience while our engineers work to resolve this.

IDENTIFIED 16 days ago - at 05/31/2026 08:05PM

We are still seeing failures with Mac jobs starting due to high network latency and packet loss. We will continue to update as we have more information on a resolution.

IDENTIFIED 16 days ago - at 05/31/2026 07:09PM

We are continuing to work on resolving the networking issue for Mac jobs.

IDENTIFIED 16 days ago - at 05/31/2026 06:15PM

We have identified a network outage that is preventing Mac jobs from starting. This include m4pro.medium and m4pro.large resource types.

We are working with our infrastructure provider to restore service.

We will update this incident as we work to resolve the issue.

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