Problem mounting Windows 7 64 bit share: Negative RFC1002 Session Response Error 0x83000001)

Still unable to mount a share from a Windows 7 64 bit server on a linux client.
The share is accessible via smbclient on Linux and from Win XP systems on the
network. I also added the AllowLegacySrvCall key in the registry accoring to
KB957441 but that had no effect.

The mount command is:
mount -t cifs //PIRIN/C /mnt -v -o user=yanko,ip=192.168.1.12

The error is:
mount error(112): Host is down
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

I turned on debugging in /proc/fs/cifs and got the following in the log:

  fs/cifs/cifsfs.c: Devname: //PIRIN/C flags: 64
  fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 3 with uid: 0
  fs/cifs/connect.c: Username: yanko
  fs/cifs/connect.c: UNC: \\PIRIN\C ip: 192.168.1.12
  fs/cifs/netmisc.c: address conversion returned 1 for 192.168.1.12
  fs/cifs/connect.c: Socket created
  fs/cifs/connect.c: sndbuf 16384 rcvbuf 87380 rcvtimeo 0x1b58
  fs/cifs/transport.c: Sending smb:  total_len 72
| 0x81 0x00 0x00 0x44 0x20 0x43 0x4b 0x46  |  _ _ _ D   C K F
| 0x44 0x45 0x4e 0x45 0x43 0x46 0x44 0x45  |  D E N E C F D E
| 0x46 0x46 0x43 0x46 0x47 0x45 0x46 0x46  |  F F C F G E F F
| 0x43 0x43 0x41 0x43 0x41 0x43 0x41 0x43  |  C C A C A C A C
| 0x41 0x43 0x41 0x43 0x41 0x00 0x20 0x46  |  A C A C A _   F
| 0x43 0x45 0x50 0x46 0x41 0x45 0x50 0x46  |  C E P F A E P F
| 0x45 0x45 0x42 0x45 0x4e 0x45 0x50 0x43  |  E E B E N E P C
| 0x4f 0x45 0x49 0x45 0x50 0x46 0x41 0x46  |  O E I E P F A F
| 0x45 0x45 0x50 0x43 0x4f 0x41 0x41 0x00  |  E E P C O A A _
  |  E E P C O A A _
  fs/cifs/connect.c: Existing smb sess not found
  fs/cifs/cifssmb.c: secFlags 0x37
  fs/cifs/transport.c: For smb_command 114
  fs/cifs/transport.c: Sending smb:  total_len 82
| 0x00 0x00 0x00 0x4e 0xff 0x53 0x4d 0x42  |  _ _ _ N ÿ S M B
| 0x72 0x00 0x00 0x00 0x00 0x00 0x01 0xc0  |  r _ _ _ _ _ _ À
| 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  |  _ _ _ _ _ _ _ _
| 0x00 0x00 0x00 0x00 0x00 0x00 0x3b 0x14  |  _ _ _ _ _ _ ; _
| 0x00 0x00 0x01 0x00 0x00 0x2b 0x00 0x02  |  _ _ _ _ _ + _ _
| 0x4c 0x4d 0x31 0x2e 0x32 0x58 0x30 0x30  |  L M 1 . 2 X 0 0
| 0x32 0x00 0x02 0x4c 0x41 0x4e 0x4d 0x41  |  2 _ _ L A N M A
| 0x4e 0x32 0x2e 0x31 0x00 0x02 0x4e 0x54  |  N 2 . 1 _ _ N T
| 0x20 0x4c 0x4d 0x20 0x30 0x2e 0x31 0x32  |    L M   0 . 1 2
| 0x00 0x02 0x50 0x4f 0x53 0x49 0x58 0x20  |  _ _ P O S I X
| 0x32 0x00                                |  2 _
  fs/cifs/connect.c: Demultiplex PID: 5192
  fs/cifs/connect.c: rfc1002 length 0x83000005
  fs/cifs/connect.c: Negative RFC1002 Session Response Error 0x83000001)
  fs/cifs/connect.c: Clearing Mid 0x1 - waking up
  fs/cifs/connect.c: Wait for exit from demultiplex thread
  CIFS VFS: No response for cmd 114 mid 1
  fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
  CIFS slow rsp: cmd 114 mid 1 A: 0x3a98 S: 0x3a98 R: 0xb7bc51
  fs/cifs/cifssmb.c: negprot rc -112
  fs/cifs/connect.c: CIFS VFS: leaving cifs_mount (xid = 3) rc = -112
  CIFS VFS: cifs_mount failed w/return code = -112

Is this a kernel bug?
Using latest kernel 2.6.33.3 (latest)
CIFS_VERSION   "1.62"