Yes, If I log in to my HTPC and run MC then I can connect via JRemote on my iPad.
I do not want to have to log in to my HTPC (kinda defeats the object of using JRemote, if I have to go to the lounge and get the keyboard out). I was hoping that simply powering the HTPC on was sufficient as the service is then running. Have I missed something out in setting up my system?