Most important part of the setup is for a Xerox device, the Search Directory Root, Get that wrong, or don't use it, and it will almost always fail. No idea why. Also, for something and giggles, switch between ADS and Exchange and see if it works
If using Exchange, Swap port to 3268 (global catalogue port) supports larger packet size and has longer time-out.
Try (|(sn=LDAP*)(cn=LDAP*)) in the custom filters
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