Thanks aaronruss. I have read this page before and I followed it step by step, and I could join the wotkstation to the windows domain and I could see all users and groups. Even I think Linux (Debian distribution) is checking right fine the user/password. But when I insert them:
user: DOMAIN+myuser
password: ********
I get the message:
Authentication service cannot retrieve authentication info.
But if I fail the user name or password I get the message:
Login failed.
So I think it is doing something right... and something wrong
Do someone know what could be happening???