for the group base dn , you need specify ou attribute
Your ldap configuration should resemble like this
groupBaseDN = ou=Groups,dc=splunksupport,dc=com;
*This is the Base of your Groups in LDAP. You can also specify multiple bases. For example: ou=Management,ou=Groups,dc=Splunkers,dc=com;ou=Consultants,ou=Groups,dc=Splunkers,dc=com;
For more Info
https://www.splunk.com/blog/2009/08/13/ldap-auth-configuration-tips.html
Hope it helps
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