User Experience: Affected users were unable to authenticate to the Yammer Online service using Single Sign On.
Customer Impact: Customer impact appeared to be limited during this event.
Incident Start Time: Saturday, May 16, 2015, at 8:00 PM UTC
Incident End Time: Saturday, May 16, 2015, at 11:14 PM UTC
Preliminary Root Cause: Engineers identified that affected users were attempting to connect to the Yammer Online service via specific network configuration settings. 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.