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CircleCI · Developer toolsMay 31, 2026, 18:15 UTC

Mac jobs failing to start

MinorNetworkUpdated 38h ago
May 31, 18:15 UTCJun 1, 00:45 UTC
Duration
6h 29m
Impact
Minor
Root cause
Network
CircleCI, 90 days
27 incidents
Affected
macOS Jobs
Status page

Final update

Mac jobs have now fully recovered. Thank you for your patience during this incident.

Timeline

  1. Resolved · Jun 1, 00:45 UTC
    Mac jobs have now fully recovered. Thank you for your patience during this incident.
  2. Monitoring · Jun 1, 00:42 UTC
    We have processed the backlog of Mac jobs and job start times are recovering to normal parameters.
  3. Monitoring · Jun 1, 00:24 UTC
    We are seeing Mac jobs starting successfully and improved network connectivity to the Mac fleet. We will continue to monitor the recovery.
  4. Identified · May 31, 22:38 UTC
    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.
  5. Identified · May 31, 21:24 UTC
    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.
  6. Identified · May 31, 20:05 UTC
    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.
  7. Identified · May 31, 19:09 UTC
    We are continuing to work on resolving the networking issue for Mac jobs.
  8. Identified · May 31, 18:15 UTC
    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.

More from CircleCI

Full history

Also caused by network

All
StartedIncidentDuration
Sep 1901:36 UTCElevated errors in Ashburn, VA (IAD)Cloudflare0m
Sep 410:57 UTCIncreased errors on High Performance Edge Network - FRA RegionNetlify0m
Sep 214:18 UTCUpstream network issuesFly.io1h 39m
Sep 116:11 UTCService degradation in GCP us-central-1ClickHouse19m
Sep 114:44 UTCMultiple products in us-central1-b are experiencing network service degradation.Google Cloud4h 8m
Aug 1503:42 UTCIncreased Packet lossAWS3d

Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.

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