Here are the basic steps if you are doing this from the UI (you can also go to the CLI and update authentication.conf):
From your search head, go to Settings > Access Controls > Authentication Method
Select LDAP and click on Configure Splunk to use LDAP
Click New, populate the required fields on the form and save.
If the connection to your LDAP host works, your strategy will be saved and you can then click on "Map Groups" to assign Splunk roles to you Active Directory groups.
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