Running the current branch of ConfigMgr (1511), while starting a bare metal OSD task sequence you may receive an error message that states “Failed to find a valid network adapter”. It appears that the system is not receiving an IP address in a fast enough manner for SCCM. In the smsts.log file, you will see this error:
Failed to find a valid network adapter. Please ensure that this machine has a network adapter and appropriate network drivers.
Unspecified error (Error: 80004005; Source: Windows)