Hi,

I have the same problem in Lucid.

in "/etc/nsswitch.conf" I have (more important)
===================
passwd:         files ldap winbind
group:          files ldap winbind
shadow:         files ldap

hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4 wins
networks:       files dns
===================

my smb.conf (from testparm output)

======================
[global]
	workgroup = MYDOMAIN
	realm = MYDOMAIN.COM
	server string = %h server (Servidor de Archivos - Samba %v, Ubuntu)
	security = ADS
	allow trusted domains = No
	obey pam restrictions = Yes
	password server = otherserver.mydomain.com
	log level = 2
	log file = /var/log/samba/log.%m
	max log size = 1000
	name resolve order = host wins bcast
	time server = Yes
	unix extensions = No
	printcap name = cups
	dns proxy = No
	wins server = 192.168.1.22
	idmap uid = 10000-33554431
	idmap gid = 10000-33554431
	template shell = /bin/bash
	winbind enum users = Yes
	winbind enum groups = Yes
	invalid users = "@MYDOMAIN\equipos del dominio"
	admin users = admin_user
	cups options = raw
	wide links = Yes
	delete readonly = Yes
	dos filetime resolution = Yes
	fake directory create times = Yes
======================

and in the syslog, I have many errors from different daemons (samba, snmpd and ntp), but with "nss_wins" ident, for example:

================
nss_wins[XXX]: call_nt_transact_ioctl(0x90078): Currently not implemented.
nss_wins[XXX]: check_usershare_stat: file /var/lib/samba/usershares/. owned by uid 0 is not a regular file
nss_wins[XXX]: Error writing 4 bytes to client. -1. (Transport endpoint is not connected)
nss_wins[XXX]: /etc/snmp/snmpd.conf: line 3: Error: bad source address
nss_wins[XXX]: gbahamonde (192.168.1.188) couldn't find service abastecimiento
nss_wins[XXX]: getpeername failed. Error was Transport endpoint is not connected
nss_wins[XXX]: last message repeated 2 times
nss_wins[XXX]: last message repeated 3 times
nss_wins[XXX]: last message repeated 4 times
nss_wins[XXX]: libsmb/nmblib.c:834(send_udp)
nss_wins[XXX]: lib/util_sock.c:1491(get_peer_addr_internal)
nss_wins[XXX]: lib/util_sock.c:539(read_fd_with_timeout)
nss_wins[XXX]: lib/util_sock.c:738(write_data)
nss_wins[XXX]: nb-informatica (192.168.1.197) couldn't find service .
nss_wins[XXX]: net-snmp: 1 error(s) in config file(s)
nss_wins[XXX]: NET-SNMP version 5.4.2.1
nss_wins[XXX]: Packet send failed to 192.168.1.22(137) ERRNO=Network is unreachable
nss_wins[XXX]: param/loadparm.c:8328(check_usershare_stat)
nss_wins[XXX]: param/loadparm.c:8555(process_usershare_file)
nss_wins[XXX]: param/loadparm.c:8569(process_usershare_file)
nss_wins[XXX]: process_usershare_file: share name ::{2227a280-3aea-1069-a2de-XXXXXXXXX} contains invalid characters (any of %<>*?|/\+=;:",)
nss_wins[XXX]: process_usershare_file: stat of /var/lib/samba/usershares/astecimiento failed. No such file or directory
nss_wins[XXX]: process_usershare_file: stat of /var/lib/samba/usershares/nzalez failed. Permission denied
nss_wins[XXX]: process_usershare_file: stat of /var/lib/samba/usershares/bholmes failed. Permission denied
nss_wins[XXX]: process_usershare_file: stat of /var/lib/samba/usershares/arria failed. Permission denied
nss_wins[XXX]: lbornoz (172.16.102.XXX) couldn't find service abilidad
nss_wins[XXX]: lbornoz (172.16.102.XXX) couldn't find service plan_pub
nss_wins[XXX]: read_fd_with_timeout: client 0.0.0.0 read error = Connection reset by peer.
nss_wins[XXX]: read_fd_with_timeout: client 0.0.0.0 read error = Connection timed out.
nss_wins[XXX]: Received TERM or STOP signal... shutting down...
nss_wins[XXX]: smbd/nttrans.c:2119(call_nt_transact_ioctl)
nss_wins[XXX]: smbd/process.c:62(srv_send_smb)
nss_wins[XXX]: smbd/service.c:1202(make_connection)
nss_wins[XXX]: xp-virtual (XXXXXXXX= couldn't find service ::{2227XX80-3aea-1069-a2de-08002b30309d}
nss_wins[XXX]: write_data: write failure in writing to client 0.0.0.0. Error Connection reset by peer
================

If I restart the daemons (samba, ntp or snmp), so the syslog register the correct daemon in the ident field.. 
but, after reboot of machine the problem comeback and is necessary restart the daemons again.

On previous Ubuntu version (9.10) this problem don't exists.

and the problem is that logcheck, logwatch and other softwares relational with logs work wrong.

thanks and attentive