This is doing a very minimal setup, just to get it working so you can tweak whatever you need. Hopefully following this you will at least have a working basic connection/authentication system working. Going to assume a fair amount of knowledge of LDAP.

The ins and outs of configuring Websphere Portal 6.1.5 with OpenLdap are too numerous to count. My experience has been that there are about 4-5 ways of doing the same thing and in the end there is only really 1 way of doing it successfully. I am only going to document the correct way since my adventure will not be the same as yours and chances are you will still have to do some discovering even if you follow this exactly.