Microsoft 365 outage: racks of servers failing health checks, all new deployments paused
rickasaurus · x · 2026-11-13
Microsoft 365's status account issued an unusually severe incident update: elevated load was not driven by traffic growth but by a number of servers becoming unexpectedly unavailable, straining remaining infrastructure. Microsoft says it has "aggressively pursued all pathways," paused all new deployments, moved traffic off affected infrastructure, and traced the root cause to a configuration change causing servers to fail automated health checks. It is testing a fix while restarting all affected servers (incident EX1550543 / MO1550821). Commenters note Microsoft rarely uses this kind of wording unless the incident is truly serious.
Related event: Microsoft Global Outage Knocks Out Outlook, Teams and Copilot for Hours(35 posts)→
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