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.
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Log Name: Lync Server
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Source: LS Centralized Logging Agent
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Date: DateTime
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Event ID: 33040
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Task Category: (1007)
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Level: Error
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Keywords: Classic
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User: N/A
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Computer: ComputerName
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Description:
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Centralized Logging Service Agent Error starting background thread to process traces.
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Log Type - IISLogManager, Error - Object reference not set to an instance of an object.
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Cause: Internal error
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Resolution:
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Examine error details to determine resolution.
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Event Xml:
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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
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<System>
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<Provider Name="LS Centralized Logging Agent" />
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<EventID Qualifiers="50159">33040</EventID>
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<Level>2</Level>
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<Task>1007</Task>
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<Keywords>0x80000000000000</Keywords>
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<TimeCreated SystemTime=" DateTime" />
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<EventRecordID>39492</EventRecordID>
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<Channel>Lync Server</Channel>
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<Computer>ComputerName</Computer>
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<Security />
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</System>
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<EventData>
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<Data>IISLogManager</Data>
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<Data>Object reference not set to an instance of an object.</Data>
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</EventData>
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</Event>
Resolution
To fix this issue, install the latest cumulative update for Skype for Business Server 2015.
