A status code of 429 is associated with the error message "Too many requests". The intent behind the code, according to RFC 6585, is to indicate that a given client has sent too many requests to the server in a given amount of time. This may be the case in this instance, in which case you may find that retrying after a substantial delay will allow the server to cease throttling the connection. However, it should be noted that any status code could be given at any time, and that the server may be returning status 429 for a non-standard reason.
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