md5 autentication error

Folks

I am a little confused, I am trying to implement md5
autentication protocol,
as the field is used salt?
is hash of md5 algorithm?
how build the key?
the server log say:
'Password authentication failed for user'
is algun example of as it is the protocol?

best regards
mdc

__________________________________________________
Correo Yahoo!
Espacio para todos tus mensajes, antivirus y antispam �gratis!
�Abr� tu cuenta ya! - http://correo.yahoo.com.ar