[Samba] Samba 3.5.6 : netlogon_creds_server_check errors in logs

[Jaymzwise Jaymzwise]

Hi,

I have a Samba (v3.5.6) PDC with a LDAP backend. We have Windows XP and 7
workstations, everything "seems" to run smoothly but the following messages
appear in the logs for each Windows 7 joined to the domain :

Jan 21 10:45:13 srvlan smbd[2737]: [2013/01/21 10:45:13.722795,  0]
rpc_server/srv_netlog_nt.c:714(_netr_ServerAuthenticate3)
Jan 21 10:45:13 srvlan smbd[2737]:   _netr_ServerAuthenticate3:
netlogon_creds_server_check failed. Rejecting auth request from client
HP8540P_13_NG machine account HP8540P_13_NG$

We can access samba shares from 7 workstations and users can authenticate
on the domain but I would like to have clean logs.

How can I resolve this problem ?
Thanks.