Installing Identity Synchronization in a firewalled enviroment

Question

I am currently attempting to install the Identity Synchronization in a replica envirnment of our current network infrastructure.
I am having difficulties installing the Identity Synchronization Server Core on a machine behind a firewall with the Sun Directory Server outside of the firewall.
SUN DIrectory Server (Public IP)
|
(Public IP) Firewall (Private IP)
|
Identity Sync Core Server (Private IP)
Each time I attemt to install the Core Server, the installation fails, and the logs indicate that the Core Installer is not able to contact the Directory Server on ldap://saturn.xxx.xxx.xx:389
If I try to contact the server witht eh LDP.exe tool from Microsoft, I am able to view the directory. So there is no problem of communication.
I have attempted to open all traffic between the Directory Server and the Identity Server to cope with the mesage brokers dynamic port, and any other port requirements, but that did not allow the Installation to complete either.
I have noticed that the Sun Directory Services are "Heavily" dependent on DNS lookups. Since there is no way for the Directory Server to resolve the Identity Server, can this cause the Identity Server Core installation to fail?
If any one can help me I would be apreciative. If you need more information, I can upload a schematic of what my current test envirnment looks like, or I can attempt to answer any question that might help.

Answer 1

The Installation Logs from the Synchronization Installer:
Looking for the configuration directory server URL in C:\Program Files\Sun\MPS
Using null as the configuration directory URL.
EXCEPTION: ldap Url is null
EXCEPTION: netscape.ldap.LDAPException: no connection parameters (89); Bad parameter to an LDAP method
Will connect to the configuration directory using the URL, ldap://saturn.cct.xxx.xxxx.xx:389.
Checking to see if core is already installed under dc=XXX,dc=xxx
Core is not installed.
Examining the configuration directory to determine if core is partially installed at dc=XXX,dc=xxx
All requisite patches appear to be present.
java -server option is available.
java -server option is available.
Checking if sun-id-srv.acis.xxx.xxxx.xx is the localhost by binding to port 7676
Encountered exception while searching for ServerGroup saturn.cct.xxx.xxxx.xx
Identified data source version as: 6.0
Creating o=NetscapeRoot into the configuration Directory
EXCEPTION: Cannot upload the templates failed to connect to server saturn:389. netscape.ldap.LDAPException: failed to connect to server saturn:389 (91); Cannot connect to the LDAP server
EXCEPTION: Exception while uploading the o=netscapeRoot schema