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Authorizing DHCP failed error 20079

    Question

  • Hi

    New Windows Server 2016 standard VM (Hyper-v). After adding DHCP, authorizing it gives below error. 

    How can I fix this?

    Thanks

    Regards

    Thursday, January 5, 2017 6:53 AM

Answers

  • Try the below step, that will help:

        • Run AdsiEdit (You may need to install the Windows 2003 Server Support Tools if you’re an AdsiEdit virgin).
        • Its best practise to run it on a Global Catalog server.
        • Expand Configuration, expand CN=Configuration, expand CN=Services, and then click CN=NetServices.
        • Right-click CN=Your_DHCP_Root, and then click Properties.
        • In the Select a property to view list, click DHCPServers.
        • In the Values list, click the name of the new DHCP server, click Remove, and then click OK.
        • Click CN=NetServices, right-click the entry for the new DHCP server, and then click Delete.
        • Force replication of Active Directory to the other sites, or wait for the replication cycle to be completed.
        • Reboot the new server. Yeah –  you have to reboot.
        • Attempt to authorise the server again.

        or you may follow below:

        1. Open Active Directory Sites and Services.
        2. Click Services, and then click Net Services. If you can’t see Services, click to select Show Services Node on the View menu.
        3. In the right pane, right-click the name of the DHCP servers that you cannot add to Active Directory, and then click Delete.
    • Force replication of Active Directory to the other sites, or wait for the replication cycle to be completed.

    • Edited by sunny.sinha Thursday, January 5, 2017 11:18 AM
    • Marked as answer by Y a h y a Thursday, January 5, 2017 6:00 PM
    Thursday, January 5, 2017 11:17 AM

All replies

  • Hello Yahiya,

    Can you try restarting the DHCP service once and authorize again?

    also please check if the server name is already present in authorized servers in AD?https://blogs.technet.microsoft.com/networking/2009/02/27/old-dhcp-servers-appear-in-the-list-of-authorized-servers-after-a-domain-rename/

    Thanks

    krishna

    Thursday, January 5, 2017 9:24 AM
  • Try the below step, that will help:

        • Run AdsiEdit (You may need to install the Windows 2003 Server Support Tools if you’re an AdsiEdit virgin).
        • Its best practise to run it on a Global Catalog server.
        • Expand Configuration, expand CN=Configuration, expand CN=Services, and then click CN=NetServices.
        • Right-click CN=Your_DHCP_Root, and then click Properties.
        • In the Select a property to view list, click DHCPServers.
        • In the Values list, click the name of the new DHCP server, click Remove, and then click OK.
        • Click CN=NetServices, right-click the entry for the new DHCP server, and then click Delete.
        • Force replication of Active Directory to the other sites, or wait for the replication cycle to be completed.
        • Reboot the new server. Yeah –  you have to reboot.
        • Attempt to authorise the server again.

        or you may follow below:

        1. Open Active Directory Sites and Services.
        2. Click Services, and then click Net Services. If you can’t see Services, click to select Show Services Node on the View menu.
        3. In the right pane, right-click the name of the DHCP servers that you cannot add to Active Directory, and then click Delete.
    • Force replication of Active Directory to the other sites, or wait for the replication cycle to be completed.

    • Edited by sunny.sinha Thursday, January 5, 2017 11:18 AM
    • Marked as answer by Y a h y a Thursday, January 5, 2017 6:00 PM
    Thursday, January 5, 2017 11:17 AM
  • >In the right pane, right-click the name of the DHCP servers that you cannot add to Active Directory, and then click Delete.

    Worked.

    Thanks

    Regards

    Thursday, January 5, 2017 6:00 PM