Hi,
Thank you for posting in Microsoft Q&A forum.
1,It sounds like a network issue. Firstly, you can try to add the WinPE driver for the storage and network for Alienware Aurora r16 to have a try. Similar thread for your reference:
How to fix stop code: INACCESSIBLE BOOT DEVICE
2,Please check if your firewall / antivirus software is blocking traffic between the server and client.
Thanks for your time. Have a nice day!
Best regards,
Simon
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