[Samba] Does someone know about the mean of this log ?

[Yohann Ferreira]

[2004/05/03 08:42:54, 1] smbd/sesssetup.c:reply_spnego_kerberos(173)
  Failed to verify incoming ticket!
[2004/05/03 08:42:54, 1] smbd/sesssetup.c:reply_spnego_kerberos(173)
  Failed to verify incoming ticket!
[2004/05/03 08:42:54, 1] smbd/sesssetup.c:reply_spnego_kerberos(173)
  Failed to verify incoming ticket!
[2004/05/03 08:43:09, 1] smbd/sesssetup.c:reply_spnego_kerberos(173)
  Failed to verify incoming ticket!
[2004/05/03 08:43:09, 1] smbd/sesssetup.c:reply_spnego_kerberos(173)
  Failed to verify incoming ticket!

What kind of mistake does it mean ?
For information, I've done a Samba 3 member of a 2k domain, and with a kinit 
and a net ads join, i have successfully joined it.
Now, I just can't authenticate from a windows client to the samba server. Do 
I use the a bad backend ?

Thanks for reading !

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