Final Status: Engineers have confirmed that the modification to the Domain Name System (DNS) configuration successfully remediated impact.
User Experience: Affected users were unable to access the Yammer service from China. As a workaround, users could connect to the service using Windows Phone, Android, or iOS apps.
Customer Impact: Customer impact was limited throughout the duration of the incident. Impact was specific to users connecting from China.
Incident Start Time: Friday, April 10, 2015, at 9:29 AM UTC
Incident End Time: Friday, April 10, 2015, at 3:20 PM UTC
Preliminary Root Cause: A third-party Content Delivery Network (CDN) used to serve static page assets was inaccessible.
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: Further investigate the underlying cause of the issue and implement a solution to prevent future reoccurrences.
Please consider this service notification the final update on the event.