Always use orbited-debug.cfg. If there's a test case that orbited-debug.cfg doesn't support, tell us and we'll fix it.
Open up your hosts file:
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Linux - /etc/hosts
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Windows - %SystemRoot%\system32\drivers\etc\hosts
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Mac OSX - /private/etc/hosts
Modify your hosts file to point www.orbited, sub.www.orbited, and xp.orbited at 127.0.0.1.