Hi,
Thank you for posting in Microsoft Q&A forum.
1,How many clients are facing this issue, all of them or only some? Please help check the smspxe.log on the server to see if there is any further information.
2,What version of Windows ADK you are using now? Are both boot Images (x64 and x86) deployed? Please help check your PXE-enabled DPs are working fine.
3, Is there a Task sequence deployed to all unknown computers or to the computer being booted?
Thanks for your time. Have a nice day!
Best regards,
Simon
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