Users cannot longer logon after taken down BDC

[wish01]

Hi, I have been having this problem for days now and I couldn't find a clue.
I have a Windows NT 4.0 domain environment running Small Business Server with about 100 client machines.
I installed a second BDC with the purpose to synchronize with the PDC and removed for a lab test to upgrade to Windows 2003.
This new BDC, it seems to respond faster to logon requests. All users are authenticated with this machine.
Now, when I try to take it out of the network, users get a message like: not logon server available or bad user name or password. Stand alone servers seems to loose trust relationship with the domain and everything is a mess.
If I put back the new BDC on line, everything is back to normal.
I have the latest services packs, I have run manual synchronization before to remove the new BDC but nothing changes.
I am running WINS only on my Exchange Server 5.5
Any help will be highly appreciated.
Thank you

 

[nodowntime]

I had this same issue a week or so ago. Every time I'd take down the BDC, suddenly no one could logon.

If you go to the PDC, open a command prompt, and type nbtstat -n. If there is a Conflict by your domain-name<1C> entry, I know what might be the solution to your problem.

 

[wish01]

Hi nodowntime,
I followed your thread before and I checked that. Unfortunately, I don't see a conflict by the domain name.
(INet~Services <1C> Group Registered)
It is like workstations are always looking the new BDC for authentication, and cannot see the PDC or the original BDC.
Thank you for your answer.
George