Microsoft LYNC Application Restored - 8:16 AM

Jun 23, 2014 5:24 PM

Service restored

Closure Summary: On Monday, June 23, 2014, at approximately 3:30 PM UTC, engineers received reports of an issue in which some customers were unable to sign in to the Lync Online service. Investigation determined that network traffic routing for user connectivity was in a degraded state. At 7:30 PM UTC, engineers re-routed network traffic to alternate capacity, which restored connectivity for a subset of customers. Engineers continued analyzing network traffic to further isolate the source of the issue for the remaining affected customers, and identified an additional degraded portion of network infrastructure that was preventing connections from being routed successfully. Engineers implemented a configuration change to bypass the affected network infrastructure to restore service. The issue was successfully fixed on Monday, June 23, 2014, at 11:14 PM UTC. A post-incident report will be available on the Service Health Dashboard within five business days.

Customer Impact: Some customers were unable to sign in to the Lync Online service. Some customers experienced intermittent connection errors, disconnects, and limited functionality when signing in.

Percent of Users Affected: Customers experiencing this issue may have seen up to 100% of their users affected.

Incident Start Time: Monday, June 23, 2014, at 3:30 PM UTC

Incident End Time: Monday, June 23, 2014, at 11:14 PM UTC

Preliminary Root Cause: A portion of network infrastructure which routes network traffic was in a degraded state. The underlying root cause is under investigation.

Next Steps:
Action: Identify the underlying root cause and develop a solution to prevent reoccurrences.
Action by: Lync Online
When: June 2014