[Samba] Errors with SPN's and DsCrackNames

[James]

Received the following in my samba logs. Any ideas what all this means?
I'm used to seeing the SPN's from time to time. Never the DsCrackNames one.


[2015/05/16 12:24:21.998389,  0, pid=1137, effective(0, 0), real(0, 0)]
../source4/rpc_server/drsuapi/writespn.c:237(dcesrv_drsuapi_DsWriteAccountSpn)
  Failed to modify SPNs on
CN=PFRECSUP,OU=Computers,OU=staff1,OU=sup,OU=PF,DC=domain,DC=local:
error in module acl: Constraint violation during LDB_MODIFY (19)
[2015/05/16 12:31:24.982134,  0, pid=1137, effective(0, 0), real(0, 0)]
../source4/rpc_server/drsuapi/writespn.c:237(dcesrv_drsuapi_DsWriteAccountSpn)
  Failed to modify SPNs on
CN=BKWS,OU=Computers,OU=staff2,OU=sup,OU=PF,DC=domain,DC=local: error in
module acl: Constraint violation during LDB_MODIFY (19)
[2015/05/16 12:31:30.791152,  0, pid=1137, effective(0, 0), real(0, 0)]
../source4/rpc_server/drsuapi/writespn.c:237(dcesrv_drsuapi_DsWriteAccountSpn)
  Failed to modify SPNs on
CN=BKWS,OU=Computers,OU=staff2,OU=sup,OU=PF,DC=domain,DC=local: error in
module acl: Constraint violation during LDB_MODIFY (19)
[2015/05/21 09:55:38.774000,  0, pid=1137, effective(0, 0), real(0, 0)]
../source4/rpc_server/drsuapi/dcesrv_drsuapi.c:449(dcesrv_drsuapi_DsCrackNames)
  DsCrackNames: Unsupported operation requested: FFFFFFF8DsCrackNames:
Unsupported operation requested: FFFFFFF8DsCrackNames: Unsupported
operation requested: FFFFFFF8DsCrackNames: Unsupported operation
requested: FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported opera +>
  tion requested: FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested:
FFFFFFF8DsCrackNames: Unsupported operation requested: FFFFFFF8Failed to
modify SPNs on CN=SCAN,OU=ADP,OU=Servers,OU=IT,OU=PF,DC=domain,DC=local:
error in module acl: Constraint violation during LDB_MODIFY (19)

-- 
-James