Lost Keynote Remote connection to iPhone

I had a Keynote Remote connection set up between the iPhone and PowerBook, but now the iPhone does not appear in Remote Preferences. Both devices are on the same wifi network, running Keynote '09, Keynote Remote running on the iPhone, and still has the laptop showing as a Keynote link. Seems like if I could completely remove the link from both devices, it could re-establish the link, but I can't find how to remove the link from the iPhone.