Connect from iphone to LDAP on a non-standard port

I asked on superuser, it was migrate to the apple stack exchange site and it was suggested I ask here.

This feels like cross posting but...

I've tried a quite a few different sequences, such as appending the port to the server address, but all to no avail. Has anyone been able to connect to an LDAP that runs on a different port than 389? If so, I would appreciate confirmation that it is possible and steps on how you set things up would be even better.

My LDAP is apacheDS and the port it runs on is not 389, so I'm at a loss how an iPhone or iPad can connect to the LDAP.