when I try to enable a user for LUM in iManager, I get this error:

Creating secure SSL LDAP context failed:
simple bind failed:

I had to change the ports of LDAP, because I'm using a product that's
relying on OpenLDAP.
When I connect to this server with an LDAP browser, everything works fine.

The admin user is LUM enabled, the problem only arises with additional
created users.

Any Ideas?