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Can't resolve my computer name with tnsping

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Last Modified: 2013-12-19
I just moved my oracle database from an old machine to a new one with a fresh oracle instillation. When connecting to the old machine I could use the computer name in tnsnames.ora but now that doesn't work. I can tnsping successfully if I enter the IP into tnsnames.ora. Why is this?

The server computer is running windows 2000 server.
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