CIFS error: "mount error 11"

[Jeffrey G Thomas]

I cannot mount a Windows2003 Enterprise share on my Redhat 5.1 server.  Nearly every time, the mount fails, but the few times it has worked I've done nothing differently.

My /etc/fstab entry:
>  \\192.168.35.11\Backups  /mnt/backups  cifs  credentials=/root/.cred,noauto,gid=500,uid=500,file_mode=0777,dir_mode=0777,rw  0  0

Sometimes the mounting works but usually is does not, giving the error:
>  [root at rhel51 ~]# mount /mnt/backups/
>  mount error 11 = Resource temporarily unavailable
>  Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)
which clarifies nothing for me.

If I change the fstab entry to 'smbfs', I get this error:
>  [root at rhel51 ~]# mount /mnt/backups/
>  mount: unknown filesystem type 'smbfs'

I am not sure if these are related or not, from /var/log/samba/smbd.log:
>  [2008/07/09 13:24:38, 0] auth/auth_util.c:create_builtin_administrators(792)
>    create_builtin_administrators: Failed to create Administrators
>  [2008/07/09 13:24:38, 0] auth/auth_util.c:create_builtin_users(758)
>    create_builtin_users: Failed to create Users
>  [2008/07/09 13:27:49, 0] auth/auth_util.c:create_builtin_administrators(792)
>    create_builtin_administrators: Failed to create Administrators
>  [2008/07/09 13:27:49, 0] auth/auth_util.c:create_builtin_users(758)
>  create_builtin_users: Failed to create Users

...and from /var/log/samba/wb-NETBIOSNAME.log
>  [2008/07/09 13:27:49, 0] nsswitch/winbindd_passdb.c:sid_to_name(130)
>    Possible deadlock: Trying to lookup SID S-1-1-0 with passdb backend
>  [2008/07/09 13:27:49, 0] nsswitch/winbindd_passdb.c:sid_to_name(130)
>    Possible deadlock: Trying to lookup SID S-1-5-2 with passdb backend

Can anyone help me with this?  The kernel is:
>  2.6.18-53.1.6.el5 #1 SMP .... x86_64 x86_64 x86_64 GNU/Linux