The last lines.
Forcibly closed. (they slammed the door in your face)
It could be something as simple as the service was down for maintenance (or someone goofed).
You might have done something to get banned like too many rapid requests.
(Calibre has a (default tweak) setting to normally prevent this. Too many uses can get apps blocked (anti-bot) for being bad netziens. Please don't force rapid fetches from a public service.
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