samba - Sep 2012 - errors in log: Failed to bind to uuid ...@ncalrpc

What this entry from from log may mean?

[2012/09/10 09:55:01,  0]
../source4/rpc_server/netlogon/dcerpc_netlogon.c:1256(dcesrv_netr_LogonGetCapabilities)
  ../source4/rpc_server/netlogon/dcerpc_netlogon.c:1256 Bad credentials - error
[2012/09/10 09:55:01,  0]
../source4/librpc/rpc/dcerpc_util.c:660(dcerpc_pipe_auth_recv)
  Failed to bind to uuid 12345678-1234-abcd-ef00-01234567cffb for
12345678-1234-abcd-ef00-01234567cffb at ncalrpc:127.0.0.1[DEFAULT,sign,seal]
NT_STATUS_UNSUCCESSFUL