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Promotion to DC fails

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by hgrossman

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We replaced a proxy server (which was a BDC) with a new ISA server. Kept the same name PROXY. Want to make that server BDC again.

However every time I try to dcpromo the 2003 server I get this error:

“The operation failed because:

The promotion failed because the name of local computer is the name of a predefined security identifier. Please rename the computer.

"The requested name already exists as a unique identifier."”

I went through the AD and DNS and removed anything relating to “Proxy” name of the Windows 2003 machine. I removed the Proxy from the domain and I still get this error when trying to dcpromo.

All my clients are programmed to communicate with “Proxy” to access the web. How to I promote “Proxy” to a DC without having to change the name?

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