samba - Mar 2005 - (no subject)

Hello,

We use CIFS(2.2.12) on HPUX 11.00 and we see some error messages in log
file like:

fgy538:chip:/var/opt/samba# tail -f log.smbd
  cli_nt_setup_creds: request challenge failed
[2005/02/24 13:14:32, 0] rpc_client/cli_trust.c:(141)
  modify_trust_password: unable to setup the PDC credentials to machine
x.x.x.x Error was : NT_STATUS_UNSUCCESSFUL.
[2005/02/24 13:14:32, 0] rpc_client/cli_trust.c:(247)
  2005/02/24 13:14:32 : change_trust_account_password: Failed to change
password for domain DOM.
[2005/03/10 15:02:54, 0] smbd/server.c:(793)
  smbd version 2.2.12 based HP CIFS Server A.01.11.03 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2002
[2005/03/10 15:02:54, 0] param/loadparm.c:(2286)
  No path in service $IPC - using /tmp

The smb.conf is:
[global]
        workgroup = DOM
        netbios name = vobs1tst

        security = DOMAIN
        encrypt passwords = Yes
        password server = x.x.x.x
        username map = /etc/opt/samba/users.map
        wins server = x.x.x.x
        create mask = 0775
        directory mask = 0775
        oplocks = No
        kernel oplocks = No
        case sensitive = No
        preserve case = Yes
        local master = No
      [S1]
        comment =  Storage Directory
        path = /S1
        read only = No

[$IPC]
        hosts deny = 0.0.0.0/0

Can anyone give me any clue?

Thanks a lot,
Andrew