Assume that you have a Unified Extensible Firmware Interface (UEFI)-based computer, and you make it PXE boot from a Windows Deployment Services (WDS) server. When the Windows Boot Manager is loaded and the operating system list is displayed, if you press the Esc key to cancel the operation, you may receive the following error message:
Windows Deployment Services (Server IP: xx.xx.xx.xx)
Windows Deployment Services encountered an error:
Error Code: 0xc000009a
Windows Deployment Services encountered an error:
Error Code: 0xc000009a