Final Status: Engineers determined that a portion of the network authentication service was degraded, which impacted Yammer service sign in. Impact was mitigated by refreshing the authentication services’ cached data.
User Impact: Affected users may have been unable to sign in to Yammer.
Customer Impact: Analysis of incident scope indicated that many customers likely had users experiencing impact related to this event. Some customers reported that their organization was affected by this issue.
Incident Start Time: Wednesday, November 11, 2015, at 12:17 AM UTC
Incident End Time: Wednesday, November 11, 2015, at 1:06 AM UTC
Preliminary Root Cause: A portion of the network authentication services was degraded. The underlying root cause is under investigation.
Next Steps: The following is a list of known action item(s) associated with this incident. As part of the Office 365 problem management process, additional engineering actions may be identified to improve the overall service.
– Action: Identify the underlying root cause and develop a solution to prevent reoccurrences.
Please consider this service notification the final update on the event.