Can’t bind to 10.5 server when SSL is enabled for LDAP

In the process of setting up a new Open Directory domain using Leopard Server, I've now found that I can't bind to the server when I check the SSL box in Directory Utility. The server is using a proper SSL cert, and the CA cert is also specified. I just always get an error like "The directory doesn't support SSL connections". Has anyone else gotten this to work? As I'm not a fan of running LDAP in the clear, this is holding up further development and deployment for me. -lilmatt