The issue of 2019 3 - Patch in April caused, can cause problems all use the WDS PXE DP of the client using the PXE boot, the interface is given as follows:
Microsoft's official documentation as follows:
https://support.microsoft.com/zh-cn/help/4512816/devices-that-start-up-using-preboot-execution-environment-pxe-images-f
Solution:
Currently, this issue has been resolved in the latest of the LCU.
Workaround:
Alternatively, you can resolve this problem by modifying the following registry value on the DP.
HKEY_LOCAL_MACHINE \ SOFTWARE \ in the Microsoft \ the SMS \ DP \ RamDiskTFTPWindowSize: 4
HKEY_LOCAL_MACHINE \ SOFTWARE \ in the Microsoft \ the SMS \ DP \ RamDiskTFTPBlockSize: 1456
HKEY_LOCAL_MACHINE \ the SYSTEM \ CurrentControlSet \ Services \ WDSServer \ Providers \ WDSTFTP \ MaximumBlockSize: 1456