Reset apple server 10.6 ( snow leopard ) root, admin and diradmin password

reset root and admin (local accounts) passwords with apple CD. reset open directory (LDAP) directory administrator password

sudo mkpassdb -dump | grep diradmin

this will give a slot no like this
slot 0001: 0x00000000000000000000000000000001

then type this

sudo mkpassdb -setpassword 0x00000000000000000000000000000001

enter the new password you good to go