Database Software

I have been trying to set this up for my company on a test db so we can have a look, and I just cannot seem to get it to work. No matter what settings I use I cannot get a connection to fail due to lack of encryption. I can connect from any client without any encryption settings. The software is acting like the encryption requirements are not being enforced, and no doubt encryption is not being used. I used Net Manager to set up my sqlnet.ora variables for the server and I know that the Advance Security software is installed properly. Are there any prerequisites to using network encryption? Is it required that SSL be set up for example?

Thanks
-mcslain