[Samba] Samba on domain member refuses to work after certain time has passed

[Konstantin Boyandin]

Hello,

The configuration files for PDC and the server in question are below. 
Both have Samba 3.5.6 installed, firewalls pass all smb/nmb traffic, 
CentOS 5.5.x86_64 runs on both.

The situation: after the server (DEVSERV in the example below) starts 
its Samba, it works fine for approx 1-1.5 days. After that it abruptly 
stops servicing any shared resources. The only cure is to stop Samba, 
erase *.tdb files from /etc/samba and /var/lib/samba, join the domain anew -

net rpc join -SPDC -Uroot

and restart the Samba. After that, it works perfectly for 1-1.5 days again.

I have noticed the following lines today in the DEVSERV's 
/var/log/samba/log.nmbd:

[2010/11/11 15:42:45.748362,  0] 
nmbd/nmbd_nameregister.c:137(register_name_response)
   register_name_response: WINS server at IP 10.1.0.10 rejected our name 
registration of DEVEL<00> IP 10.1.0.12 with error code 5.
[2010/11/11 15:42:45.748439,  0] 
nmbd/nmbd_namelistdb.c:307(standard_fail_register)
   standard_fail_register: Failed to register/refresh name DEVEL<00> on 
subnet UNICAST_SUBNET

May I ask for suggestions on what's to correct?

Thanks.

Configuration files:
PDC, IP 10.11.12.10
eth0's net is 10.11.12.0/24
There are eth0:0, eth0:1, eth:2 I do nto wish to use for Samba (this is 
why interfaces are mentioned)

-------------- PDC smb.conf below ------
[global]
unix charset = UTF8
workgroup = MYDOMAIN
netbios name = PDC
server string = PDC for MYDOMAIN
passdb backend =ldapsam:"ldap://10.11.12.1 ldap://10.11.12.10"
username map = /etc/samba/smbusers
interfaces = eth0 lo
bind interfaces only = yes
log level = 1
syslog = 0
log file = /var/log/samba/%m
max log size = 0
name resolve order = wins bcast hosts
time server = Yes
printcap name = CUPS
add user script = /usr/sbin/smbldap-useradd -m '%u'
delete user script = /usr/sbin/smbldap-userdel '%u'
add group script = /usr/sbin/smbldap-groupadd -p '%g'
delete group script = /usr/sbin/smbldap-groupdel '%g'
add user to group script = /usr/sbin/smbldap-groupmod -m '%g' '%u'
delete user from group script = /usr/sbin/smbldap-groupmod -x '%g' '%u'
set primary group script = /usr/sbin/smbldap-usermod -g '%g' '%u'
add machine script = /usr/sbin/smbldap-useradd -w '%u'
shutdown script = /var/lib/samba/scripts/shutdown.sh
abort shutdown script = /sbin/shutdown -c
logon script = %u.bat
logon drive = W:
logon home = \\%L\%u
logon path = \\%L\profiles\%u
domain logons = Yes
domain master = Yes
wins support = Yes
ldapsam:trusted = yes
ldap ssl = off
ldap suffix = dc=example,dc=com
ldap machine suffix = ou=Computers
ldap user suffix = ou=Users
ldap group suffix = ou=Groups
ldap idmap suffix = ou=Idmap
ldap admin dn = cn=sambaadmin,dc=example,dc=com
idmap backend = ldap://10.11.12.1
idmap uid = 10000-20000
idmap gid = 10000-20000
printer admin = root
printing = cups
-------------- PDC smb.conf above ------

DEVSERV, IP 10.11.12.12

-------------- DEVSERV smb.conf below ------
[global]
workgroup = MYDOMAIN
server string = DEVSERV server`
netbios name = DEVSERV
log file = /var/log/samba/log.%m
max log size = 50
unix extensions = no
security = domain
password server = 10.11.12.1
local master = no
os level = 33
preferred master = no
wins server = 10.11.12.10
dns proxy = yes
load printers = yes
cups options = raw
-------------- DEVSERV smb.conf above ------

Sincerely,
Konstantin