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Removing an old DC

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by rob.wilcox1 1 view

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We have a problem trying to remove AD from one of our Domain Controllers. We are of course running a DCPROMO, it tells us that it's already a DC and asks us if we want to demote it to a member server.

It is a machine called OLD-MACHINE, and it has as it's primary DNS server itself. (Each of our DC's has DNS running on it).

We go a few steps through the wizard and are asked for a username and password from the enterprise admins group, which we supply, then a second or so later we get the "progress dialog box" appear, and then the following error...

"The operation failed becase:

The Directory Service failed to replicate off changes made locally.

The DSA operation is unable to proceed because of a DNS lookup failure"

We checked out the MS KB which said that we should put the machine's IP address as the preferred DNS Server, but we already did that.

Please help

Thanks

Rob Wilcox

3 replies

by oridjinn

Rob,

I had a very similar problem. It was the same exact message that you are getting now, but the problem was when I was using dcpromo to try to promote the server to a Domain Controller. This is not a problem with DNS or a lookup in the DNS, it is actually a problem with the SYSVOL with the DNS entry for the domain. The work-around --> First try installing Service Pack 1 on your Global Catalog (Even if you have already installed it). Then try re-installing Windows 2K on the system mentioned above, this should keep your current system setting without the DC settings. If the system retains the DC settings, install Service Pack 1 on the system above and try running DCPromo to demote. Hope this helps!

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