Windows dns an unknown error occurred while validating the server
Indicates that a terminating error has occurred while performing an MBAM Configurator task.The error message will contain more details about the error.If an SPN is already registered on the app pool account in AD then make sure that it is not registered on other accounts. The event indicates that a task is being invoked by the MBAM Setup.Known tasks include getting IIS configuration such as binding information and root site, and configuring Service Principal Name (SPN).
This error is also logged if MBAM cannot access Active Directory (AD) to validate user accounts.
The tables in this section provide information about MBAM Server log event IDs.
The following table contains messages and troubleshooting information for event IDs that can occur on the MBAM Server during configuration.
Verify that all MBAM software prerequisite checks pass.
Make sure the MBAM registry path, if exists, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MBAM Server and all the subkeys are readable.
Verify that IIS is installed and correctly configured.