You install September 2014 Cumulative Update 5.0.8308.815 for Microsoft Lync Server 2013. Before that, you did not install August 2014 Cumulative Update 5.0.8308.738. In this situation, the Centralized Logging Service Agent Service (RTCCLSAGT) cannot be started or cannot capture data.
Additionally, you receive the following event in the Event Viewer.
Additionally, you receive the following event in the Event Viewer.