samba - Jan 2003 - Need help with strange "rejected the tconX on the IPC$ share" error messages.

One Win2k client constantly generates these messages in the log:

===================================================================Jan 30
16:50:32 server smbd[30271]: [2003/01/30 16:50:32, 0]
rpc_client/cli_spoolss_notify.c:spoolss_connect_to_client(134)

Jan 30 16:50:32 server smbd[30271]:   connect_to_client: machine KW1
rejected the tconX on the IPC$ share. Error was :
NT_STATUS_ACCESS_DENIED.
===================================================================
Samba is a PDC, none of the other systems generate this error, the
problem system outwardly works just fine, all of the users can logon to
the domain and use the system.

Any clues?

Thanks.

Chris