Hi,
This is a late post but try this - for ldapfetch, ldapfilter and ldapgroup make sure you have a default stanza in your ldap.conf. this default stanza should point to the global catalog server
refer: https://docs.splunk.com/Documentation/SA-LdapSearch/2.1.4/User/Theldap.confconfigurationfile#.27Default.27_stanza
Also, make sure you add an alternatedomain to this default stanza.
Make sure this alternatedomain is not repeated in any other stanza, otherwise you would run into duplicate alternatedomain error.
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