string_to_sid: Sid S-0-0 is not in a valid format

[Mthales]

My syslog is getting filled up with the following messages being repeated every few minutes:

Dec 5 15:48:01 servername winbindd[4791]: [2006/12/05 15:48:01, 0] lib/util_sid.c:string_to_sid(285)
Dec 5 15:48:01 servername winbindd[4791]: string_to_sid: Sid S-0-0 is not in a valid format.

The system seems to be working ok with the authentication from the windows 2003 domain controller and in all other ways. But this bothers me. So does anyone have any ideas what's causing it?

The system is a Ubuntu v6.06.1 server with samba (smbd -V says version 3.0.22)

Thanks

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