I have a Samba 3.0.22 server running as security = user encrypt passwords = no and WinNT 4.0 service pack 6 with plain text password. WinNT4 client can't connet to Samba 3.0.22 server: [2006/06/13 10:26:55, 3] smbd/negprot.c:reply_negprot(579) Selected protocol NT LM 0.12 [2006/06/13 10:27:00, 5] auth/auth.c:make_auth_context_subsystem(489) Making default auth method list for security=user, encrypt passwords = no [2006/06/13 10:27:00, 5] auth/auth.c:check_ntlm_password(271) check_ntlm_password: unix authentication for user [brusok] FAILED with error NT_STATUS_WRONG_PASSWORD [2006/06/13 10:27:00, 2] auth/auth.c:check_ntlm_password(317) check_ntlm_password: Authentication for user [brusok] -> [brusok] FAILED with error NT_STATUS_WRONG_ [2006/06/13 10:27:00, 5] auth/auth_util.c:free_user_info(1485) attempting to free (and zero) a user_info structure [2006/06/13 10:27:00, 10] auth/auth_util.c:free_user_info(1488) structure was created for brusok [2006/06/13 10:27:00, 3] smbd/error.c:error_packet(146) error packet at smbd/sesssetup.c(1063) cmd=115 (SMBsesssetupX) NT_STATUS_LOGON_FAILURE But the same user can connect to Samba 3.0.22 server from WinXP.