[Samba] Changed PDC IP, all hell broke lose

[Paul Raines]

I had to move my RedHat 5 box acting as a PDC to a new IP address. It is
running samba 3.5.10.  After the move, none of my windows or linux samba
clients worked anymore.  I tried rejoining some to the domain, but would
get error

Unable to find a suitable server
Join to domain 'MRIRESEARCH' is not valid


The old PDC IP address is 132.183.202.95 and nothing is at that IP anymore 
(for 4 days now).  The new IP is 172.21.21.35

I ran 'net -d 10 join' and would see it was still trying to connect to
the old IP address.  I tried 'net cache flush' to no avail.  I shut
down samba, removed every file in /var/cache/samba and still no change.
It tries to go to the old IP address.

On the PDC box, I increase 'os level' from 60 to 70, stopped the nmbd and smbd 
processes, did a 'net flush cache' and restarted nmbd and smbd. Still it 
fails and the nmbd log as the following.

==========
[2012/09/04 10:09:25,  0] nmbd/nmbd.c:857(main)
   nmbd version 3.5.10-0.110.el5_8 started.
   Copyright Andrew Tridgell and the Samba Team 1992-2010
[2012/09/04 10:09:25.716397,  0] nmbd/nmbd_logonnames.c:160(add_logon_names)
   add_domain_logon_names:
   Attempting to become logon server for workgroup MRIRESEARCH on subnet 172.21.21.35
[2012/09/04 10:09:25.716599,  0] nmbd/nmbd_logonnames.c:160(add_logon_names)
   add_domain_logon_names:
   Attempting to become logon server for workgroup MRIRESEARCH on subnet 192.168.0.150
[2012/09/04 10:09:25.716671,  0] nmbd/nmbd_logonnames.c:160(add_logon_names)
   add_domain_logon_names:
   Attempting to become logon server for workgroup MRIRESEARCH on subnet UNICAST_SUBNET
[2012/09/04 10:09:25.716768,  0] nmbd/nmbd_become_dmb.c:337(become_domain_master_browser_wins)
   become_domain_master_browser_wins:
   Attempting to become domain master browser on workgroup MRIRESEARCH, subnet UNICAST_SUBNET.
[2012/09/04 10:09:25.716828,  0] nmbd/nmbd_become_dmb.c:351(become_domain_master_browser_wins)
   become_domain_master_browser_wins: querying WINS server from IP 0.0.0.0 for domain master browser name MRIRESEARCH<1b> on workgroup MRIRESEARCH
[2012/09/04 10:09:25.722744,  0] nmbd/nmbd_logonnames.c:121(become_logon_server_success)
   become_logon_server_success: Samba is now a logon server for workgroup MRIRESEARCH on subnet UNICAST_SUBNET
[2012/09/04 10:09:25.722928,  0] nmbd/nmbd_become_dmb.c:235(become_domain_master_query_success)
   become_domain_master_query_success:
   There is already a domain master browser at IP 132.183.202.95 for workgroup MRIRESEARCH registered on subnet UNICAST_SUBNET.
[2012/09/04 10:09:29.096239,  0] nmbd/nmbd_logonnames.c:121(become_logon_server_success)
   become_logon_server_success: Samba is now a logon server for workgroup MRIRESEARCH on subnet 172.21.21.35
[2012/09/04 10:09:29.096382,  0] nmbd/nmbd_logonnames.c:121(become_logon_server_success)
   become_logon_server_success: Samba is now a logon server for workgroup MRIRESEARCH on subnet 192.168.0.150
[2012/09/04 10:09:49.731244,  0] nmbd/nmbd_become_lmb.c:395(become_local_master_stage2)
   *****

   Samba name server PDC-NMR is now a local master browser for workgroup MRIRESEARCH on subnet 172.21.21.35

   *****
[2012/09/04 10:09:49.731468,  0] nmbd/nmbd_become_lmb.c:395(become_local_master_stage2)
   *****

   Samba name server PDC-NMR is now a local master browser for workgroup MRIRESEARCH on subnet 192.168.0.150

   *****
[2012/09/04 10:10:10.732440,  0] nmbd/nmbd_browsesync.c:247(domain_master_node_status_fail)
   domain_master_node_status_fail:
   Doing a node status request to the domain master browser
   for workgroup MRIRESEARCH at IP 132.183.202.95 failed.
   Cannot sync browser lists.
[2012/09/04 10:10:10.732636,  0] nmbd/nmbd_browsesync.c:247(domain_master_node_status_fail)
   domain_master_node_status_fail:
   Doing a node status request to the domain master browser
   for workgroup MRIRESEARCH at IP 132.183.202.95 failed.
   Cannot sync browser lists.

=============================================

Where is it still getting the old IP address?

The the clients are all set with

    remote announce = 172.27.88.81
    wins server = 172.27.88.81
    security = domain
    password server = pdc.nmr.mgh.harvard.edu
    workgroup = MRIRESEARCH

The WINS server is run by central IT group of the hospital and I have
no control over it.

DNS is properly changed:

# host pdc.nmr.mgh.harvard.edu
pdc.nmr.mgh.harvard.edu is an alias for raidsrv01.nmr.mgh.harvard.edu.
raidsrv01.nmr.mgh.harvard.edu has address 172.21.21.35

---------------------------------------------------------------
Paul Raines                     http://help.nmr.mgh.harvard.edu
MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
149 (2301) 13th Street     Charlestown, MA 02129	    USA





The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.