pfSense

Im running pfSense 2.0, with an LDAP server running on CentOS6 (iRedmail). Both are in virtual machines, on a connected virtual interface, with fill connectivity.

From my physical machine, I can use LDAPTool to connect to LDAP and browse. I am also able to telnet from the pfsense box to port 389 on the LDAP server. However, when I set up LDAP on pfSense (as shown in http://db.tt/08MVfSTu ) and click "save and test" under authentication, I get the following message:
http://db.tt/vGLqNiHZ

Once I enabled anonymous authentication LDAP, save and test works.

Additionally, to track the issue down, I added the following to /etc/inc/auth.inc (near line 723)

if ($ldapanon == true) {
       if (!$res = @ldap_bind($ldap))) {
          @ldap_close ($ldap);
-->       log_error("break 3");     //My additional code
          return false;
          }
else........

And on clicking "Save and test", I do get that "break 3" in /var/log/system.log even though it is not set for anonymous auth.

I have tried deleting and recreating the LDAP server in pfSense, as well as rebooting in between, and the issue persists. Only with anonymous auth enabled in LDAP can pfsense connect (otherwise, it errors out with "pfmaster php: /system_usermanager_settings_test.php: ERROR! ldap_get_groups() could not bind to server iRedmail.")