LDAP Public Address Book? (Redhat IPA)

[craig2015]

Versions:
roundcubemail-1.1.3/
ipa-server-4.1.0

I'd like to configure the LDAP address book for read only public access with a global bind and TLS auth from Roundcube.  I'm just struggling to get debugging to inform me of the issue?

[12-Oct-2015 11:33:22 +1100]: <ikqnm48j> PHP Error: Could not connect to LDAP (POST /?_task=mail&_action=autocomplete?_task=&_action=)
[12-Oct-2015 11:33:22 +1100]: <ikqnm48j> LDAP Error: Could not connect to any LDAP server, last tried ipa.example.com in /usr/local/roundcubemail-1.1.3/program/lib/Roundcube/rcube_ldap.php on line 424 (POST /?_task=mail&_action=autocomplete?_task=&_action=)

regards,

Craig