thank's for helping !!
no infos in messages, only some DHCPPACK and DHCPREQUEST with the mac adress, but no error !
however i got this:
[root@acf-srv ~]# grep postesc -H /var/log/samba/*
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service netlogon initially as user simonec (uid=5042, gid=5042) (pid 9992)
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 9992)
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service netlogon
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service simonec
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service netlogon initially as user admin (uid=0, gid=101) (pid 10010)
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service admin initially as user admin (uid=0, gid=101) (pid 10010)
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service netlogon
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service admin
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service netlogon initially as user simonec (uid=5042, gid=5042) (pid 10020)
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 10020)
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 10040)
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service simonec
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service netlogon
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service simonec
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service admin initially as user admin (uid=0, gid=101) (pid 13006)
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service Primary initially as user admin (uid=0, gid=101) (pid 13006)
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service temp initially as user admin (uid=0, gid=101) (pid 13006)
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service Primary
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service temp
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service admin
/var/log/samba/log.postesc: postesc (192.168.100.126) connect to service temp initially as user admin (uid=0, gid=101) (pid 13053)
/var/log/samba/log.postesc: postesc (192.168.100.126) closed connection to service temp
and
[root@acf-srv ~]# cat /var/log/samba/log.postesc
[2006/10/06 14:49:15, 0] rpc_server/srv_netlog_nt.c:get_md4pw(244)
get_md4pw: Workstation POSTESC$: no account in domain
[2006/10/06 14:52:46, 0] rpc_server/srv_netlog_nt.c:get_md4pw(244)
get_md4pw: Workstation POSTESC$: no account in domain
[2006/10/06 15:23:58, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service netlogon initially as user simonec (uid=5042, gid=5042) (pid 9992)
esmith::isInGroup() called too early to check prototype at /usr/local/bin/generate_netlogon line 87.
[2006/10/06 15:24:04, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 9992)
[2006/10/06 15:27:06, 1] rpc_server/srv_util.c:get_domain_user_groups(298)
get_domain_user_groups: primary gid of user [simonec] is not a Domain group !
get_domain_user_groups: You should fix it, NT doesn't like that
[2006/10/06 15:27:06, 0] rpc_server/srv_util.c:get_alias_user_groups(206)
get_alias_user_groups: gid of user simonec doesn't exist. Check your /etc/passwd and /etc/group files
[2006/10/06 15:27:09, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service netlogon
[2006/10/06 15:27:09, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service simonec
[2006/10/06 15:37:48, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service netlogon initially as user admin (uid=0, gid=101) (pid 10010)
esmith::isInGroup() called too early to check prototype at /usr/local/bin/generate_netlogon line 87.
[2006/10/06 15:37:53, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service admin initially as user admin (uid=0, gid=101) (pid 10010)
[2006/10/06 15:38:54, 1] rpc_server/srv_util.c:get_domain_user_groups(298)
get_domain_user_groups: primary gid of user [simonec] is not a Domain group !
get_domain_user_groups: You should fix it, NT doesn't like that
[2006/10/06 15:38:54, 0] rpc_server/srv_util.c:get_alias_user_groups(206)
get_alias_user_groups: gid of user simonec doesn't exist. Check your /etc/passwd and /etc/group files
[2006/10/06 15:40:10, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service netlogon
[2006/10/06 15:40:10, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service admin
[2006/10/06 15:47:14, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service netlogon initially as user simonec (uid=5042, gid=5042) (pid 10020)
esmith::isInGroup() called too early to check prototype at /usr/local/bin/generate_netlogon line 87.
[2006/10/06 15:47:15, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 10020)
esmith::isInGroup() called too early to check prototype at /usr/local/bin/generate_netlogon line 87.
[2006/10/06 15:57:58, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 10040)
[2006/10/06 16:11:17, 0] lib/util_sock.c:read_socket_data(384)
read_socket_data: recv failure for 4. Error = Connection timed out
[2006/10/06 16:11:17, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service simonec
[2006/10/06 16:11:17, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service netlogon
[2006/10/06 17:22:31, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service simonec
[2006/10/06 17:22:31, 1] rpc_server/srv_util.c:get_domain_user_groups(298)
get_domain_user_groups: primary gid of user [simonec] is not a Domain group !
get_domain_user_groups: You should fix it, NT doesn't like that
[2006/10/06 17:22:31, 0] rpc_server/srv_util.c:get_alias_user_groups(206)
get_alias_user_groups: gid of user simonec doesn't exist. Check your /etc/passwd and /etc/group files
esmith::isInGroup() called too early to check prototype at /usr/local/bin/generate_netlogon line 87.
[2006/12/01 15:33:55, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service admin initially as user admin (uid=0, gid=101) (pid 13006)
[2006/12/01 15:35:10, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service Primary initially as user admin (uid=0, gid=101) (pid 13006)
[2006/12/01 15:35:10, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service temp initially as user admin (uid=0, gid=101) (pid 13006)
[2006/12/01 15:35:14, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service Primary
[2006/12/01 15:35:14, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service temp
[2006/12/01 15:35:14, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service admin
[2006/12/01 15:37:59, 1] smbd/service.c:make_connection_snum(648)
postesc (192.168.100.126) connect to service temp initially as user admin (uid=0, gid=101) (pid 13053)
[2006/12/01 15:38:10, 1] smbd/service.c:close_cnum(841)
postesc (192.168.100.126) closed connection to service temp
[2006/12/19 17:10:57, 1] auth/auth_sam.c:sam_account_ok(123)
sam_account_ok: Account for user 'admin' was disabled.
[2006/12/19 17:10:57, 1] auth/auth_sam.c:sam_account_ok(123)
sam_account_ok: Account for user 'admin' was disabled.
and
(entrée standard): postesc (192.168.100.126) connect to service netlogon initially as user simonec (uid=5042, gid=5042) (pid 9992)
(entrée standard): postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 9992)
(entrée standard): postesc (192.168.100.126) closed connection to service netlogon
(entrée standard): postesc (192.168.100.126) closed connection to service simonec
(entrée standard): postesc (192.168.100.126) connect to service netlogon initially as user admin (uid=0, gid=101) (pid 10010)
(entrée standard): postesc (192.168.100.126) connect to service admin initially as user admin (uid=0, gid=101) (pid 10010)
(entrée standard): postesc (192.168.100.126) closed connection to service netlogon
(entrée standard): postesc (192.168.100.126) closed connection to service admin
(entrée standard): postesc (192.168.100.126) connect to service netlogon initially as user simonec (uid=5042, gid=5042) (pid 10020)
(entrée standard): postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 10020)
(entrée standard): postesc (192.168.100.126) connect to service simonec initially as user simonec (uid=5042, gid=5042) (pid 10040)
(entrée standard): postesc (192.168.100.126) closed connection to service simonec
(entrée standard): postesc (192.168.100.126) closed connection to service netlogon
(entrée standard): postesc (192.168.100.126) closed connection to service simonec
(entrée standard): postesc (192.168.100.126) connect to service admin initially as user admin (uid=0, gid=101) (pid 13006)
(entrée standard): postesc (192.168.100.126) connect to service Primary initially as user admin (uid=0, gid=101) (pid 13006)
(entrée standard): postesc (192.168.100.126) connect to service temp initially as user admin (uid=0, gid=101) (pid 13006)
(entrée standard): postesc (192.168.100.126) closed connection to service Primary
(entrée standard): postesc (192.168.100.126) closed connection to service temp
(entrée standard): postesc (192.168.100.126) closed connection to service admin
(entrée standard): postesc (192.168.100.126) connect to service temp initially as user admin (uid=0, gid=101) (pid 13053)
(entrée standard): postesc (192.168.100.126) closed connection to service temp
(entrée standard):@400000004549ff6f1503bce4 7f000001:a045:a5aa + 0001 postesc.domain.fr
(entrée standard):@4000000045534c2e0dd724ec 7f000001:4b50:9f3e + 0001 postesc.domain.fr
but there is old log because I tried to add manually posteSC (the XP client) to the domain controler, then to delete it, then to add in samba...