Well, finally something happened. We´ve reinstalled the server on the port 8530 and the XP clients came to our WUS manager screen. But things aren´t good enough, we´ve configured 6 (six) XP clients pointing the WUS server but I don´t know why only appears 4 (four) of them in WUS manager in the same time. They´re kind of alternating themselves into the WUS. All the six clients are working properly but there are only 4 clients in the WUS manager, got it? That´s too weird cause there isn´t a logic reason to behave like that, I hope you guys can give some answear. Thanx you all