CLS log service crashes when starting IISLog and CMDletDebug in Skype for Business Server 2015 (KB5005514)

Applies To
Skype for Business Server 2015

Symptoms

When you start the IISLog scenario by using the Start-CsClsLogging cmdlet in Microsoft Skype for Business Server 2015, the CLS log service crashes, and the following event is logged. This issue also occurs when you start CMDletDebug.
 

  • Log Name:      Lync Server
  • Source:        LS Centralized Logging Agent
  • Date:          DateTime
  • Event ID:      33040
  • Task Category: (1007)
  • Level:         Error
  • Keywords:      Classic
  • User:          N/A
  • Computer: ComputerName
  • Description:
  • Centralized Logging Service Agent Error starting background thread to process traces.
  • Log Type - IISLogManager, Error - Object reference not set to an instance of an object.
  • Cause: Internal error
  • Resolution:
  • Examine error details to determine resolution.
  • Event Xml:
  • <Event xmlns="http:⁠//schemas.microsoft.com/win/2004/08/events/event">
  • <System>
  • <Provider Name="LS Centralized Logging Agent" />
  • <EventID Qualifiers="50159">33040</EventID>
  • <Level>2</Level>
  • <Task>1007</Task>
  • <Keywords>0x80000000000000</Keywords>
  • <TimeCreated SystemTime=" DateTime" />
  • <EventRecordID>39492</EventRecordID>
  • <Channel>Lync Server</Channel>
  • <Computer>ComputerName</Computer>
  • <Security />
  • </System>
  • <EventData>
  • <Data>IISLogManager</Data>
  • <Data>Object reference not set to an instance of an object.</Data>
  • </EventData>
  • </Event>

Resolution

To fix this issue, install the latest cumulative update for Skype for Business Server 2015.