Now i don't know if this is specific to my setup, i have a non server mac mini running leopard server as a home server / music server attached to my home cinema system, but i've never managed to get the included remote to work with it and to control front row (but that's a whole other topic by itself!). However today i was randomly flicking around on my macbook pro trying to work out why it's randomly beeping at me for no real apparent reason and found the following in the security settings under system preferences....
Ahah!... Checked the same place on the server and, sure enough, it was there and checked. Now as i said, i don't know if i've accidentally checked this myself or if it's automatically set on the server version of the OS as a security default or something. Either way it's working now :o)
Now just to find why my laptop's beeping at me everytime i start a new sentence....