Endpoint Prevent on Enforce Server

I'm still new to the product and trying to setup a demo environment in our lab. I've done Single-Tier installs before, but this time I elected to install the Detection on another server so I guess this would be a two-tier installation. I've installed the software for the Network Discover on a seperate server and added the Server through the GUI on Enforce. I am now trying to add the Endpoint Prevent server to the same server as Enforce. I use the 127.0.0.1:8100 for the Host and keept the Agent with the default settings. The status for Endpoint Prevent is stuck at Unkown after restarting the server and services many times. 

Is there a fundamental thing I'm missing?