Connecting Zimbra GAL

Hi,

I'm trying to connect my Zimbra contacts to my Mac so that the addresses could appear in my Mail client. Is there any configuration I need to do with my server? Currently the server is using Internal Authentication.

I tried creating a LDAP link in my Mac with the following format.

Server: my.ZimbraServerAddress.com
Search Base: dc= ZimbraServerAddress, dc=com
Scope: Subtree
Authentication: None

I have tried both SSL and Non-SSL and both doesn't work

Thanks.