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Patch Management / Patch Tuesday

Microsoft Finally Delivers a Fix for High CPU for WSUS Servers

Microsoft introduced yet another problem in customer environments after releasing the August cumulative update. See: High CPU Usage for the WSUS Server After August Cumulative Update.

The issue causes the following:

  • High CPU on your WSUS server – 70-100% CPU in w3wp.exe hosting WsusPool
  • High memory in the w3wp.exe process hosting the WsusPool – customers have reported memory usage approach 24GB
  • Constant recycling of the W3wp.exe hosting the WsusPool (identifiable by the PID changing)
  • Clients failing to scan with 8024401c (timeout) errors in the WindowsUpdate.log
  • Mostly 500 errors for the /ClientWebService/Client.asmx requests in the IIS logs


With just a few days left in August, Microsoft has now delivered updates for the applicable platforms. These updates should be applied to ALL WSUS servers in your environment:

Windows Server 2016 (KB4039396)
Windows Server 2012 R2 (KB4039871)
Windows Server 2012 (KB4039873)
WSUS 3.0 SP2 (KB4039929)


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