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Message: <blockquote data-quote="georgius" data-source="post: 971896" data-attributes="member: 107951"><p>You're right that reason why it doesn't continue is HTTP 503 response. If you omit some information in request (like user agent or referer, maybe special cookies), common response is HTTP 403 Forbidden or HTTP 404 Not Found. The best way how to detect what is happening is using some HTTP proxy (like <a href="http://www.fiddler2.com/fiddler2/" target="_blank">Fiddler</a> for Firefox). It will be great if you dump communication with Fiddler for deeper analysis (maybe URL is constructed in some bad way).</p></blockquote><p></p>