General :: Mount Error 6 = No Such Device Or Address

[root@servers guest]# /bin/mount -o -uid=root,gid=root,username=userid,password=user1passwd //172.16.1.212/backup/user1backup /mnt/tmp

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)
[root@servers guest]#

I also tried:

[root@servers guest]# /bin/mount -t cifs -o -uid=root,gid=root,username=user1,password=user1pass //172.16.1.212/backup/user1backup /mnt/tmp

but no luck!