Final Status: Engineers have determined that a configuration issue caused the Yammer service to become inaccessible. Engineers corrected the configuration issue and confirmed impact has been mitigated.
User Impact: Affected users may have been unable to log in to the service when using the single sign-on (SSO) feature.
Customer Impact: The issue affected only customers that use the SSO feature to log in to the Yammer service.
Incident Start Time: Wednesday, December 9, 2015, at 6:46 PM UTC
Incident End Time: Wednesday, December 9, 2015, at 7:30 PM UTC
Preliminary Root Cause: Maintenance was performed against the Yammer service, which inadvertently introduced a configuration issue on a limited portion of affected infrastructure.
As 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: Review infrastructure maintenance processes and procedures as this event occurred during scheduled maintenance with no expected impact to service availability.
Please consider this service notification the final update on the event.