Are you subscribed to this person's presence (i.e., are you in the other
person's roster with a subscription type of 'from' or 'both')? You need
to be in order for the probe to work.
But the client shouldn't need to send a probe at all. The server will send you <presence> elements from your subscribed buddies right after you log in, and whenever their status changes. All you need to do is listen for them.
�Jens
