[horde] Horde won´t recognize username and password of existing users!!!

[Emilio Ruben Estevez]

Hi, i´ve installed Horde 2.2.3 , Imp 3.2 and Turba 1.0 on a Mandrake 9.2 
Box, im using Postfix as MTA and imapd (rpm that mandrake includes). Thing 
is that i followed every step on the configuration howto, but now when im 
trying to login at webmail.mysite.com it appears the login screen for horde 
and when i input username and password of any user, horde tells me:

("Login failed for some reason. Most likely your username or password was 
entered incorrectly.")

Users im using are setted up and they can send and recieve mails correctly 
with the outlook xpress, so i don´t know what might be happening, i can only 
guess the is some error on authentication proces with horde, but i can´t 
find where is that problem!

Thanks.
Emilio

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