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I have a WDS server setup for use with MDT2010, and everything was working fine until this morning. Now, whenever I try to boot from LAN, I get an error:

Downloaded WDSNBP...

Architecture: x64
WDSNBP started using DHCP Referral.
Contacting Server: 10.50.10.12 (Gateway: 0.0.0.0)
No response from Windows Deployment Services server.
Launching pxeboot.com

My PXE Response Policy setting on the WDS is set to this:

[ ] Do not respond to any client computer
[ ] Respond only to known client computers
[o] Respond to all (known and unknown) client computers
    [X] For unknown clients, notify administrator and respond after approval

The odd thing is that if I clear the approval option (so any computer gets a response) it works fine.

I have delegated permissions on the AD OU to the computer object WDS is running on, but that doesn't seem to have helped.

As it works without approval, I can only assume my DHCP options are fine and this is some sort of AD permission problem.

(Server is Windows Server 2008 SP2)

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I'm having the same problem except that When the approval option is cleared it doesn't work fine. –  Peter Jan 6 '12 at 20:19
    
Same issue here, too. This just started happening today too, after a successful image. No idea what's changed. –  TGP1994 Nov 4 '13 at 21:33

2 Answers 2

With that option ticked, all unkown computers should boot into WDS, but then be listed on the WDS server, awaiting approval, within Pending Devices .

Try extending the PXE response delay settings. It might be failing as the devices are not being approved within WDS, after requesting the boot.

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It was mentioned here that you can remove the Mgmt folder in your WDS installation directory, replace it with an empty folder of the same name, and continue on error free.

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