DHCP failover access denied

Dharmendra Kumar 21 Reputation points
2021-11-15T13:23:50.623+00:00

we have 2 DHCP servers in the Failover relationship, they are working since 2017 without any issue, both are working as Active & Passive mode, Primary is always active, and secondary is passive (S0005470- primary and S0005471 - secondary )

and we are facing an issue:- when we add any new failover from primary server to secondary server, it gives access denied error

Error getting option definitions from S0005471 (0x5) Access is denied

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Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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  1. Limitless Technology 37,356 Reputation points
    2021-12-16T18:40:59.273+00:00

    What operating system is used? What changes were made when this happened? You can check event logs for clues.

    See the article below with a problem similar to yours, I believe it will help you better understand how to solve this scenario:

    https://learn.microsoft.com/en-us/answers/questions/571084/dhcp-client-service-does-not-start-error-5-access.html

    Go through the failover configuration process step-by-step and check the vendor classes option for two DHCP servers. According to my research, incompatible setting of the Vendor Class option on DHCP servers can cause this error. Check the vendor class of your two DHCP servers and add the missing class.

    https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/hh831385(v=ws.11)?redirectedfrom=MSDN

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