Microsoft attributes worldwide service disruption to server health check failures
The company reported that servers became unavailable after failing automated checks, affecting services including Outlook and Teams.
Microsoft has attributed a worldwide service disruption to servers that failed automated health checks and became unavailable, according to Moneycontrol. The outage, which began on November 12, has impacted services such as Outlook, Teams, and Copilot.
The Microsoft 365 Status account on X stated that when servers dropped out of service, traffic shifted to the remaining infrastructure, causing connectivity issues. Microsoft clarified that the increased load was not caused by a rise in total traffic.
A process managing secure connections became overwhelmed on the affected servers, as reported by SecurityWeek. A Microsoft spokesperson told ABC News that there is no indication of a cyberattack, and the company's status page noted no awareness of malicious activity.
Microsoft has rebooted servers, redistributed traffic, and adjusted protocols, reporting partial recovery in some regions. The company is currently monitoring a patch applied to an upstream authentication and routing configuration component to improve stability.
As of November 13, both Microsoft 365 Consumer and Business or Enterprise services remained under service degradation labels. Microsoft said it will publish a Post-Incident Report containing the root cause and repair measures once the issue is mitigated.