nt4 machine removed from domain now can't rejoin

[chunky28]

I have a windows 2000 domain controller.

This has been working fine.

I had an NT 4.0 machine which was a member of this domain.

I recently attempted to join this machine to a different subnet as I am currently setting up a new firewall.

However, I am now attempting to rejoin this machine to the domain.

But I just get the message that there is an IP conflict.

This is not the case. There are no other pc's with the same address and the name of the pc has not changed.

I thought perhaps the dc machine is refusing it because the record already exists. So I removed the machine from the list of AD computers and removed the record form the dns forward lookup zone.

If I then attempt to rejoin the PC it says "the domain controller for this domain cannot be located".

(I haven't rebooted the dc at any point as I have things running on this at the moment which prevents me from doing this)

Any ideas?

thanks

 

[N0ktar]

Check DNS first, looks like that's your problem. Can you resolve names?

 

[philote]

When you moved this machine did you change the IP settings appropriately? Or are you using DHCP?
Double-check your IP, subnet mask, ,default gateway, and DNS settings.

 

[MTVW]

Recheck IP settings....also make sure the Lan port is on the correct subnet. If you use VLANS the port you are connected to could be on the wrong one.

 

[chunky28]

The IP settings are all correct.

Both the machine and the DC are on the same subnet (255.255.255.240) and they both use the same default gateway.

I am not using DHCP. These machines are using fixed public IP addresses. I will soon be moving them into my internal subnet, but for now they must remain outside my firewall on the above subnet.

I can join the PC to the domain using an IP address I know is not being used and this works ok, but somewhere it thinks the IP address is being used...and it is...by that very machine I am attempting to rejoin!

I guess I could give the PC an IP address that is not being used, but that does not answer my problems as I may need this at some point.

Each machine has a hosts file with the details of the IP addresses. Could this be causing the confusion?

...removed these details from the hosts file....but it's made no difference.

In fact now I have attempted to join the PC back to the internal domain with an internal private IP address and a subnet of 255.255.0.0 (the same as the other PC's) and now I can't access other computers in this subnet. When I attempt to do this in network neighbourhood I get workgroup is not accessible....but I can ping the other machines in this subnet.

Thanks for the suggestions!

Charlie

 

[chunky28]

Removed record of pc and IP address in hosts file, removed record in dns and removed record in active directory......

Can now join the PC to the domain using the IP address I was using before....

Can anyone explain what they think the problem could have been......I tried this before but only removed the records from AD and DNS. The only difference this time is that I removed it from the hosts file.....and it joins the domain without any problem........is this possible?

Thanks for your advice!