1. Install ldapsearch client (part of openldap-clients):

yum install openldap-clients

2. Test ldap connection:

ldapsearch -x -b "dc=domain,dc=com" -D "user@account.com" -h x.x.x.x -W 'searchstring'

3. Enter password when prompted

Credit goes to: https://support.symantec.com/en_US/article.TECH83893.html