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The second tab is the global configuration about a single LDAP server.
Choose your LDAP type (OpenLDAP or Active Directory). This is used internally to follow (or not) referrals returned by the LDAP server and to help you with suggested mapping configuration.
Host of your LDAP. You may use either a host name / IP address or prefix it with a protocol such as
ldaps://<hostname> (latter in case you want to connect with SSL).
Whether you want to use TLS, that is typically start with an connection on default port 389 and then set up an encrypted connection.
More information on TLS may be found at http://www.openldap.org/doc/admin24/tls.html.
DN of the LDAP user you will use to connect to the LDAP server. The DN is composed of a series of RDN's which are the unique (or unique'ish) attributes at each level in the DIT. The following diagram illustrates building up the DN from the RDN's.
Your LDAP user needs to be granted access to the directory where users and groups are stored and full read access to users and groups for all attributes you plan to fetch.
When connecting to an Active Directory, this corresponds to a user account that has privileges to search for users.
CN=Administrator,CN=Users,DC=mycompany,DC=com. This user account must have at least domain user