Recently I have noticed that the update scan started failing on all the Windows 10 1607 devices with;
OnSearchComplete - Failed to end search job. Error = 0x8024401c.
Scan failed with error = 0x8024401c
At the same time SUP's CPU usage went as high as 99%, soon after deploying a servicing update to Windows 10 1607 devices. The server (SUP) became unresponsive, however as soon as I shut down the 1607 client machine the CPU usage on the server was dropped.
According to the Microsoft the issue was caused by large metadata of Windows 10 1607 updates.
To resolve this issue, Microsoft has released hotfixe's for various server platforms as below;KB4039396 for Windows Server 2016
KB4041693 for Windows Server 2012 R2
KB4041690 for Windows Server 2012
This hotfix will fix the update metadata processing and should be applied to all WSUS servers in your environment.
Once the hotfix is applied, the client devices should complete the scan process successfully.