First of all, one topic for one question is enough. Since Spanish board is de-facto abandoned, I've removed your post out there.
Second of all, you'd better read
this before posting.
How do you expect any help if you didn't provide any details?
Where did you get your Mibew Messenger distribution? What version of Mibew are you talking about?
For now the only thing that I can advise you is to double check your configuration. But that is just a guess.