I have iFolder setup on two servers. One is the master only
for the web interface, the second is currently storing the data, at least
that's what I want.

I have been seeing the case where a few of my clients are getting connected
to the master server and are using it as the data store.

The question is, what can I change or set on the master server so that no
clients can connect to it, but still have it functional for the web