I had some real fun and games getting a JIM setup on our evaluation network last week, mainly because the JIM is designed to run on a WAN side server or in a demilitarised zone.
But for those of you who need to use the Jamf Infrastructure Manager on the same LAN as the LDAP server, take a look at this article which should explain the key preparations required for DNS records which must be in place before you install the JIM. If not the LDAP Proxy service will end up listening for connections on the loopback address and failing to connect to an LDAP on the same LAN.
I actually found the same article yesterday and was going to post it. We just setup LDAP and that was a great deal of help.
Another article I found about the LDAP mappings that might help folks out too: