Joining domain-controler with windows seven

Hello,

I am testing the domain-controler appliance and it works fine with XP.

With seven Pro 64, I can connect to smb file share, but can't join the domain. It prompt me for the login and password, but after that I get a error message like "the domain doesn't exist or can't be contacted" (my message is in french). The ping is ok in both directions.

I also updated to samba4 (using apt-get), but doesn't change anything.

Do you have any clue ?

Thanks in advance,

David

PS: I'm almost a beginner with linux