The smb.conf oplocks = No level2 oplocks = No include = /etc/samba/smb.conf.%U here is the include for the user desc1, the DOS machine. dos filetime resolution = yes use sendfile = no log level = 7 log file = /var/log/samba.log.%U max log size = 50 debug timestamp = yes I guess that the only information that i obtain is that the client reset the connection but i cannot find why The only that can I try is that with a PIII 700Mhz with an onboard Intel ethernet card (E100B driver), and it works fine.The same machine with a Realtek 8139 PCI card fails (RTSND driver) But i need to use some old Pentium machines, with only ISA BUS. Downgrade to Samba 2.x will help? Here is the log. change_to_user: Skipping user change - already user [2006/03/16 09:50:13, 3] smbd/reply.c:reply_read(2496) read fnum=13413 num=89 nread=89 [2006/03/16 09:50:13, 5] lib/util.c:show_msg(454) [2006/03/16 09:50:13, 5] lib/util.c:show_msg(464) size=137 smb_com=0xa smb_rcls=0 smb_reh=0 smb_err=0 smb_flg=128 smb_flg2=1 smb_tid=1 smb_pid=16791 smb_uid=100 smb_mid=0 smt_wct=5 smb_vwv[ 0]= 89 (0x59) smb_vwv[ 1]= 0 (0x0) smb_vwv[ 2]= 0 (0x0) smb_vwv[ 3]= 0 (0x0) smb_vwv[ 4]= 0 (0x0) smb_bcc=92 [2006/03/16 09:50:58, 3] smbd/process.c:timeout_processing(1447) timeout_processing: End of file from client (client has disconnected). [2006/03/16 09:50:58, 5] lib/gencache.c:gencache_shutdown(89) Closing cache file [2006/03/16 09:50:58, 5] libsmb/namecache.c:namecache_shutdown(79) namecache_shutdown: netbios namecache closed successfully. [2006/03/16 09:50:58, 3] smbd/sec_ctx.c:set_sec_ctx(288) setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0 [2006/03/16 09:50:58, 5] auth/auth_util.c:debug_nt_user_token(433) NT user token: (NULL) [2006/03/16 09:50:58, 5] auth/auth_util.c:debug_unix_user_token(454) UNIX token of user 0 Primary group is 0 and contains 0 supplementary groups ________________________ Ing. Maurizio Faccio Merbe Ltda. Av. Italia 2348. Paysand?, Uruguay Tel : 598-72-29043 Int. 130 Fax: 598-72-22591