Can you tell me which options you have enabled in all the tabs in the Security settings pane?
There are options that control stuff like Internet Protection, NAS redirection, Javascript, ActiveX…. etc.
How are all your computers connected to the router? Wired? Wireless?
You should definetley be able to access firefly’s control panel on the server itself, though. Check that you can really make sure that firefly is running. Of that I’m not certain yet, for instance.