the name "<fqdn>" is already in use on this network. Type a name that is not in use. DCPROMO

every1isevil2
every1isevil2 used Ask the Experts™
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Hey Guys,

I'm having a very strange issue setting up a domain.

I have an existing DNS server on an adhoc network.  It currently has 2 zones on it. I am setting up a domain controller on the network and would like to use one of the zones as the domain. I have the dynamic updates enabled on the zone that i'm trying to setup AD.

I keep getting the error of:

the name "<fqdn>" is already in use on this network. Type a name that is not in use.

What is strange is I then tried to create the domain with different extensions. I have tried .local, .corp, .lan, .net, .org even .asdf and i'm getting the same error every time.

I know for a FACT none of those are in use on the network.

I have even tried to uninstall the AD binaries and install just a DNS server with the name on it and point it to itself for DNS and then reinstall the binaries. No luck.

Any help would be greatly appreciated.
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Top Expert 2013
Commented:
Have you tried a different NetBIOS name...not just changing the suffix?

thanks

Mike

Author

Commented:
yes. I have tried domain123456789.local and it still states that it is in use on the network. My apologies. I should have added that to the question.

Author

Commented:
I actually think you are on to something. The netbios name is actually really long. Netbios only uses the first 16  characters of the domain name.... The domain name that i'm testing is 18 characters and I just added to that.  Let me see if i can shorten it out a bit.

Author

Commented:
That was the problem. I had to change the domain completely due to the netbios name i was trying to use on the network was really long. I chose a much shorter domain name and it worked just fine.
Top Expert 2013

Commented:
Glad to help and you learned a lot here so outstanding work!

Thanks

Mike

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