Symptoms
When Microsoft Lync Server 2013 or Skype for Business Server 2015 Response Group Service (RGS) crashes one or two times a week with the announcement service, the affected RGS restarts automatically. However, no agents can receive calls that come through this RGS. You may see the following events in the Event Viewer:
Time: <Time> ID: 32002 Level: Information Source: LS Application Server Machine: ComputerName.contoso.com Message: The Application Host has stopped an application. The Application Host has stopped application RTCRGS Time: <Time> ID: 32007 Level: Error Source: LS Application Server Machine: ComputerName.contoso.com Message: The Application Host stopped due to an unhandled exception in the application.
The Application Host received an unhandled exception while running application urn:application:RGS. Exception information: Exception: System.Reflection.TargetInvocationException > Message: Exception has been thrown by the target of an invocation.
Cause
After the RGS crashes, it will try to restart automatically. Unfortunately, the Match Making service that's a component of the RGS doesn't connect to any Front-End server and therefore no agents can receive calls coming through RGS. The only way to make RGS in a functional operation is to manually restart the RGS on each Front-End server.
Resolution
For Skype for Business Server 2015, install the July 2018 cumulative update 6.0.9319.534 for Skype for Business Server 2015, Response Group Service.
For Lync Server 2013, install the July 2018 cumulative update 5.0.8308.1001 for Lync Server 2013, Response Group service.
