Presence probes only work if the 'from' user is on the 'to' user's roster with a
subscription type of 'from' or 'both'.
And of course, clients are never supposed to do probes themselves.
-David Waite
Jens Alfke wrote:
> A Jabber user has to explicitly approve other users' subscribing to their presence,
>which is a good privacy control. However, there doesn't seem to be any control over
>one-shot <presence type="probe"> requests. The JPO (1.4.1.2, p.10) says that the
>server responds to these, which doesn't give the user's client a chance to check for
>approval.
>
> Many people are concerned about letting random other people discover their presence
>status. Does Jabber provide a way to prevent unauthorized people from polling for
>this information?
>
> -Jens
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