PXE boot keeps failing with new SCCM 1806 without WDS RRS feed

  • Question

  • Hi there,

    We just set up SCCM 1806 on the Azure platform and have DPs on PREM.  But PXE boot keeps failing.  We have IP Helpers set up, but PXE refuses to work.  We don't have WDS set up as it's not required.  Can someone please assist?

    Thank you

    Thursday, September 20, 2018 2:43 PM

All replies

  • Have you distributed your boot images to the DPs and enabled those boot images for PXE boot.

    Jason | | @jasonsandys

    Thursday, September 20, 2018 4:25 PM
  • The problem is you are using PXE DHCP options. You need to remove those.

    Thursday, September 20, 2018 4:33 PM
  • Hi RiDER07,

    Did you do that as Kerwin said?
    If so, did you try to delete it and try it again, is there some latest information?

    Best regards,


    Please remember to mark the replies as answers if they help. If you have feedback for TechNet Subscriber Support, contact

    Friday, September 21, 2018 7:29 AM
  • @Jason - yes I have.

    Friday, September 21, 2018 10:16 AM
  • And use what instead?

    Thank you

    Friday, September 21, 2018 10:17 AM
  • IP Helpers
    Friday, September 21, 2018 12:04 PM
  • We are using IP Helper and we are now getting this error

    Where is it getting that path from? smsboot\\x86\wdsmgfw.efi ?

    And we are not using WDS, should the following be different? and not point to

    • Edited by RiDER07 Friday, September 21, 2018 1:16 PM
    Friday, September 21, 2018 1:10 PM
  • When using IP Helpers, you shouldn't have any PXE specific options configured in DHCP at all.

    Jason | | @jasonsandys

    Friday, September 21, 2018 1:35 PM
  • So how do I go about fixing this, please?

    Where should the IP HElper point to?

    Thank you

    Friday, September 21, 2018 2:04 PM
  • IP Helpers point to your PXE enabled DP so that PXE request broadcasts by the NIC in the system being PXE booted are forwarded across subnets to the PXE enabled DP(s).

    This process is identical to DHCP because DHCP and PXE use the same protocol and process.

    Jason | | @jasonsandys

    Friday, September 21, 2018 2:08 PM
  • Okay, I have set up IP Helper to point to the PXE Enabled DP.

    Now we are getting this error

    PXE-E18 - Server Response Timeout

    Any ideas?


    Friday, September 21, 2018 2:26 PM
  • Can you please share (on OneDrive) the complete SMSPXE log file?

    Friday, September 21, 2018 5:14 PM
  • Here you go, thanks.!Aij-J-w0W4HrctoPBgc-6f0FReI

    Friday, September 21, 2018 5:31 PM
  • The client PXE booting (with MAC address 58:82:A8:8C:25:0A) is not known to the SCCM site. There is no task sequence targeted to that client.

    If you have a task sequence that you want to run on than unknown machine, you have two options:

    1. Deploy the task sequence to the unknown machine collection.


    2. Import the MAC address into the site, then add the system to a collection, and then target the task sequence to that collection.

    Friday, September 21, 2018 6:27 PM
  • There is already a task sequence deployed

    The MAC address is already in SCCM

    Any ideas?


    Friday, September 21, 2018 7:43 PM
  • You then need to configure your PXE server to process unknown machines.

    On the properties of the DP, under the PXE tab, you have to enable the option "Enable unknown computer support."

    Friday, September 21, 2018 8:56 PM
  • It's already configured to process unknown machines

    Sunday, September 23, 2018 10:50 PM
  • From that SMSPXE log file that you shared, the PXE server thinks that the "Enable unknown computer support" is not enabled.

    Can you please export the PXE DP registry under HKLM\Software\Microsoft\SMS\DP and share it?

    Monday, September 24, 2018 6:55 PM
  • Also, can you please check that the broadcast reply from the PXE server is able to make it to the client? The SMSPXE log that you shared does not have a request message from the client. This means that the client is not getting the reply from the PXE server.

    Monday, September 24, 2018 6:59 PM
  • Tuesday, September 25, 2018 1:32 PM
  • How would I check that?

    Thank you

    Tuesday, September 25, 2018 1:33 PM
  • You need to work with your network team. They should be able to trace network packets and see where they are going or not going.

    The PXE server broadcast replies should be able to make it to the clients, in the same way that the DHCP server broadcast replies make it to the client.

    Tuesday, September 25, 2018 11:54 PM
  • We managed to fix this.  We implemented a DHCP and an IP Helper.

    Thanks everyone for your help.

    Thursday, October 4, 2018 12:20 PM
  • Hi, to fix this issue you heve to follow this blog:

    Friday, April 12, 2019 12:06 PM