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Why would a ‘503 – Service Temporarily Unavailable’ message appear for a website in one place, but load perfectly well in another? Other websites are loading fine where the user is receiving a 503 error.
If you’re behind a proxy server or firewall (e.g. on a company’s internal network, or in a country that controls network access), the proxy may not be working correctly, or may be too busy and will return that error.
See: http://en.wikipedia.org/wiki/Proxy_server
If you have access to the server’s log, you can test this case by reviewing the log. If requests getting 503 errors are never showing up in the log, it’s likely an error at the intermediate proxy.