[Samba] Error 2476 Bad Password

[Mathieu KRETCHNER]

I create a smb share on atlas server and after i would like to test this 
share from another linux and i did the following thing :
mount -t smbfs -o username=root    //ATLAS/share     /mnt/share/
but I get an error message :
2476: tree connect failed: ERRSRV - ERRbadpw (Bad password - 
name/password pair in a Tree Connect or Session Setup are invalid.)
SMB connection failed

Does anybody have an idea ?