[YouTube-API] Error in registering domain for OAuth1.0

I am making a rails(3.0.10) application using youtube_it api that uses
OAuth-1.0. When i go to https://accounts.google.com/ManageDomains to
register my domain (http://localhost:3000), i get an error "invalid
domain". If i remove the :3000, the domain gets added but when i click
on it at the manage registration panel, i am taken to a new page with
an error "Sorry, there seems to be a problem. The service you're
looking for is temporarily unavailable. We're working hard to restore
your access as soon as possible. Please try again in a few hours.
Thanks for your patience." What is the meaning of this? Is localhost
not allowed for testing OAuth1.0 applications or am i doing something
wrong? And why am i not allowed to add a port number?(eg:
http://beta.companyname:8080.com)

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