[linux-cifs-client] mount cifs problem

[=?KOI8-U?Q?=F3=C5=D2=C7=A6=CA?=]

Hello , I have a problem when  mounting  Win2003 server shares  to my 
Gentoo linux.

 # smbclient -L x.x.x.x -U username  returns

 ...........
       SUS             Disk
       Shares          Disk
       Multimedia$     Disk
 ...........

 I'm shure that shared folder folder  Shares  on resource  x.x.x.x 
really exists.
 Then i try mount it :
 # mount.cifs //x.x.x.x/Shares /mnt/hidden/shares/ -o
 user=username,dom=domain
 Password:
 retrying with upper case share name
 mount error 6 = No such device or address
 Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)

 And /var/log/messages I have error:

  Aug  4 17:26:27 daemon CIFS VFS: Unexpected SMB signature
 Aug  4 17:26:27 daemon CIFS VFS: Unexpected SMB signature
 Aug  4 17:26:27 daemon CIFS VFS: Unexpected SMB signature
 Aug  4 17:26:27 daemon CIFS VFS: cifs_mount failed w/return code = -6
 Aug  4 17:26:27 daemon CIFS VFS: Unexpected SMB signature
 Aug  4 17:26:27 daemon CIFS VFS: Unexpected SMB signature
 Aug  4 17:26:27 daemon CIFS VFS: Unexpected SMB signature

I do it on Gentoo linux,  kernel 2.6.12 ,  CIFS support builded i the 
kernel as module,samba 3.0.14a-r3.
Sorry for poor English and thank for all advises.
Regards.