The radius server is not seeing any client requests and your client is not getting a response from the server, either you've got the wrong address for the radius server or more likely your firewall is block their communication, this has nothing to do with ldap.
Also, I don't see the rlm_ldap module being configured in the output you sent. John - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
