pfSense

If you run the OpenVPN wizard and choose LDAP in the first step it asks you to fill in the data required to create the LDAP client.
When you complete the wizard the LDAP authserver is created but the ldap_attr fileds are not filled.

        <authserver>
            <type>ldap</type>
            <refid>5b33a3407db2e</refid>
            <name>Test_Server</name>
            <host>10.0.0.1</host>
            <ldap_port>443</ldap_port>
            <ldap_urltype>SSL - Encrypted</ldap_urltype>
            <ldap_protver>3</ldap_protver>
            <ldap_scope>subtree</ldap_scope>
            <ldap_basedn><![CDATA[CN=test.com]]></ldap_basedn>
            <ldap_authcn><![CDATA[CN=Users]]></ldap_authcn>
            <ldap_binddn><![CDATA[admin]]></ldap_binddn>
            <ldap_bindpw><![CDATA[123456]]></ldap_bindpw>
            <ldap_attr_user><![CDATA[]]></ldap_attr_user>
            <ldap_attr_member><![CDATA[]]></ldap_attr_member>
            <ldap_attr_group><![CDATA[]]></ldap_attr_group>
        </authserver>

        <step1>
            <type>ldap</type>
        </step1>
        <step2>
            <authtype>Test_Server</authtype>
            <ip>10.0.0.1</ip>
            <port>443</port>
            <transport>tcp</transport>
            <scope>subtree</scope>
            <basedn>CN=test.com</basedn>
            <authscope>CN=Users</authscope>
            <userdn>admin</userdn>
            <passdn>123456</passdn>
            <nameattr>samAccountName</nameattr>
            <groupattr>cn</groupattr>
            <memberattr>memberOf</memberattr>
            <uselist>on</uselist>
        </step2>

Also the transport is changed from TCP to SSL though you could argue that choosing port 443 there is not valid for unencrypted LDAP.