Zentyal

 [ldap]
 # LDAP server details, note the port setting, this is important for Zentyal
 uri = ldap://HOST:390
 
 # Authentication
 binddn = cn=zentyalro,dc=company,dc=com
 bindpw = password
 
 # User parameters
 userbase = ou=Users,dc=company,dc=com
 userfilter = (uid=%(user)s)
 
 # Set up the basic group parameters.
 groupbase = ou=Groups,dc=company,dc=com
 groupfilter = (objectClass=zentyalDistributionGroup)
 grouptype = GroupOfNamesType
 
 # How do I find staff
 staff = cn=TheRatticGroup,ou=Groups,dc=company,dc=com

Now this will not work right away because Zentyal is blocking port 390, lets add the exception to the firewall:

Go to "Gateway", "Firewall", "Packet Filter", "Filtering rules from internal networks to Zentyal", "Configure rules"

You will notice there is one rule with a red sign, click on "Edit" and change "Decision" from "DENY" to "ACCEPT", click "Save changes".