DCPROMO Domain controller cannot be found

I removed a server 2008 domain controller using DCPROMO as I just wanted it as a member server.  I had a few issues afterwards so I removed it from the domain and wanted to rejoin it but now get the message that a domain controller can not be found.

I have another server running SBS2003.  

Any advise on what the issue could be?

Thanks
blackadder999Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
This is a problem typically caused by incorrect DNS.  There could also be problems with active directory. Verify your DNS settings ONLY point to the SBS server on both systems and run DCDIAG and NETDIAG on the SBS system
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blackadder999Author Commented:
I've run DCDIAG and NETDIAG on the SBS and all tests were passed.  The DNS on btoh server is also pointing to the SBS<=.  Anything else you can suggest?  Thanks
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Ping the server by name... success?

If so ping by fully qualified domain name... success?

If so join the domain using the fully qualified domain name as the name of the domain you want to join.
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blackadder999Author Commented:
I found the issue.  The server I demoted had a DNS server running.  As soon as I disabled the service I was able to join the domain.  Thanks for the advise guys.

One more thing though:

We run some accountancy software from the 2008 server but when a computer is configured to use the SBS DNS it takes a couple of minutes to load.  However, when I had it pointed at the 2008 server, before i removed DNS formthere, it would open in about 10 seconds.

Any idea what could be causing this issue?  I assume it's a DNS problem but I have a problem resolving.

Thanks
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Lee W, MVPTechnology and Business Process AdvisorCommented:
So it was still using it's own DNS?

You need to look at the settings of the accounting software (might be able to help further if you specified WHAT accounting software it was).   Why would it need to access DNS for anything?  
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blackadder999Author Commented:
It's CCH Viztopia.  The software runs locally and connects to the data on the server.  I can't understand why, when it's running from the local PC itself, it takes longer to load depending on the DNS server?

I'm guessing it does some sort of network check when it launches and that's built in to the software.
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blackadder999Author Commented:
I've moved everything on to the same subnet and it's all worknig fine now.  I think the issue was the fact that I was doing this at 1am and everything made sense after a good sleep!

Thanks for all your advise.
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blackadder999Author Commented:
I managed to resolve the issue myself.
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