Microsoft Azure Stabilizes After Leap Year Glitch

From PC World: Microsoft's Azure cloud infrastructure and development service was apparently running nearly trouble-free on Thursday, following a series of outages on Wednesday that affected multiple aspects of the system

The Azure service health dashboard showed only one problem at 3 p.m. GMT, a "performance degradation" in the south-central U.S. Compute zone. "Our recovery efforts to restore compute service to impacted customers in this sub-region are complete," Microsoft said in a message on the site. However, "a small number of customers in this sub-region may face long delays during service management operations," it added.

Azure's service management component fared the worst during the outage, going out worldwide starting at 1:45 a.m. GMT on Wednesday. The dashboard showed the service management system running normally at 3 p.m. GMT on Thursday, as were other previously affected pieces of the Azure platform, including Reporting, Marketplace and Access Control 2.0.

Microsoft provided some insight into the outage's root causes in an official blog post.

"Windows Azure operations became aware of an issue impacting the compute service in a number of regions," wrote Bill Laing, corporate vice president of server and cloud. "The issue was quickly triaged and it was determined to be caused by a software bug. While final root cause analysis is in progress, this issue appears to be due to a time calculation that was incorrect for the leap year."

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