Title: Unable to sign in to Yammer.
User impact: Users may have been unable to sign in to Yammer.
Final status: We’ve updated the DNS configuration, which has remediated impact.
Scope of impact: A few customers reported this issue, and our analysis indicated that customers with a managed DNS service were more likely to be impacted.
Start time: Friday, October 21, 2016, at 11:55 AM UTC.
End time: Friday, October 21, 2016, at 1:20 PM UTC.
Preliminary root cause: Issues with DNS resolution was impacting availability of the service.
– We’re reviewing our monitoring services to find ways to reduce detection time and to improve our automated recovery processes.
We’ll publish a post-incident report within five business days.