[general xmpp] change transports password

Hello.

I have an account on jabber.org and I use some transports from other
servers.
I recently have changed the password of those transports, and now I cannot
login to them  anymore (of course). The problem is that I'm not able to
resubscribe to those transports anymore. I can neither remove
authorization, neither remove the transport from the roster. I've tried
both with psi and pidgin (on Linux): If I retire my authorization from
transport and then remove the transport, it comes back on my roster saying
my password isn't correct (icq) or that account is locked (yahoo), and  
keeping asking for my authorization. I've
tried to input inside xml console of psi the following:

<iq type='set' to='icq.jabber.at'>
<query xmlns='jabber:iq:roster'>
<item jid='icq.jabber.at' subscription='remove'/>
</query>
</iq>

Without result...
I've searched for a solution, but I don't understand well where does this  
password issue rely on... client? protocol? server...?

How can I change the password for the transports?
Or how do I disable and then re-enable them so that they will ask me for  
the password again?
Is the transport password stored anywhere on the filesystem of my pc?

Thank you

-- 
不要催我!你曾經問過梵谷畫很快嗎?

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