Remember: PXE is a chain of trust and transfers. A break anywhere along that chain yields the same error. Your job is to find exactly which link is broken.
Ensure your Network Access Account is configured correctly and the password hasn't expired. Additionally, if you are using Enhanced HTTP or PKI, ensure the certificates are valid and the MP is correctly configured to accept communication from "Workgroup" computers (which devices are during the PXE phase). 6. Examine the SMSTS.log To get the "smoking gun," you must look at the log file. While in WinPE, press F8 to open the Command Prompt. Navigate to X:\Windows\Temp\SMSTSLog\smsts.log . unable to download pxe variable file. exit code 14 sccm