Windows dns an unknown error occurred while validating the server
Verify that the binding information in IIS is not corrupt.The event message will contain more information about the specific error.Verify that the user who is running the MBAM setup has remove permissions on the SSRS instance that is configured as an SRS Role point in CM.During MBAM web site/web service installation, MBAM setup verifies if necessary prerequisites are in place.If disabling an MBAM feature or uninstalling MBAM verify that all files such as log files and web.config files are closed so MBAM can remove its web sites and web services.Verify that IIS is installed and configured correctly.
This error is also logged if MBAM cannot access Active Directory (AD) to validate user accounts.
Verify that IIS is installed and correctly configured.
Verify that the registry key HKLM\SOFTWARE\Microsoft\Inet Stp: Path WWWRoot exists and accessible.
As a part of report installation, install module tries to access the unzipped report files at installation path and communicates with SQL Reporting services to publish the report files.
The above errors occur when MBAM cannot access the files/folders at unzipped Installation path.