The Microsoft Azure Cloud suffered a worldwide service interruption on Feb. 22 that impacted secure traffic for almost a full day. People on the Internet reported either complete loss of service or extremely slow service across much of the Azure portfolio during the time period. The Azure storage service was believed to be most significantly affected. An expired SSL certificate was determined to be the source of the problem. Non-secured HTTP connectivity remained available. According to Kaspersky's Threatpost blog, Redmond posted a Feb. 23 message on its Windows Azure Service Dashboard announcing the outage. "Storage is currently experiencing a worldwide outage impacting HTTPS operations (SSL traffic) due to an expired certificate," the post read. In addition to a mea culpa, the company said in a Feb. 24 post to its Windows Azure blog that it would be issuing credits to affected customers. "Given the scope of the outage," wrote Steven Martin, general manager of Windows Azure business and operations, "we will proactively provide credits to impacted customers in accordance with our SLA."