No question South Central Azure was down
One more point from the Cedexis data on this outage: US East in Northern Virginia is a heavily trafficked Azure site, but it never quite went entirely off the air. Between roughly 7-8 p.m. Eastern standard time, users trying to access Azure from many different points around the globe suffered a similar fall off in service which took it from at least 95% available to about 5% available. Services continued running but were obviously impaired. South Central Azure, in Dallas, however, did simply go off the air with services zero % accessible, for 80-90 min., during the same period. What was the difference? I could speculate, would rather Microsoft explain.