Microsoft Confirms New Bug in Windows 10 Cumulative Updates KB4503293, KB4503327

Microsoft just confirmed a new issue created by the June 11 cumulative updates for a series of Windows 10 versions.

The software giant says that installing these cumulative updates could cause devices using PXE from a WDS or SCCM server to neglect to start.

However, please note that this issue has no effect on consumer editions of Windows 10, but only server SKUs, as you can find in the table below. Microsoft explains the following:

“Devices that start up using Preboot Execution Environment (PXE) images from Windows Deployment Services (WDS) or System Center Configuration Manager (SCCM) may fail to begin with the mistake “Status: 0xc0000001, Info: A required device isn’t connected or can not be accessed” after installing [June 11 cumulative updates] on the WDS server.”

Workaround already available

The affected Windows 10 versions are the ones listed below:
Windows Server 2008 SP2
Windows Server 2008 R2 SP1
Windows Server 2012
Windows Server 2012 R2
Windows Server 2016
Windows Server, version 1803
Windows Server 2019
Windows Server, version 1809
Windows Server, version 1903

Microsoft says a workaround already exists, and users can mitigate the issue on a SCCM server by checking when the Variable Window Extension is enable and setting the values of TFTP block size to 4096 and TFTP window size to 1.

“Try the default values for TFTP block size and TFTP window size first but depending on your environment and overall settings, you may want to adjust them for the setup. You can also try the Enable a PXE responder without Windows Deployment Service setting,” Microsoft adds.

The organization also explains that it’s already working on a treatment for this issue, which is projected to be included “in a future release.” No further specifics have been provided on when the fix should really land.

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