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431 FTP response code
A 431 response code may be sent in response to any command requiring a change in or the negotiation of a security mechanism. It is considered a transient negative reply as the error is considered temporary. In this case, the client is encouraged to restart the FTP transaction and try again.
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Overview
This article provides information on 431 FTP response code.
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Resolution
A 431 response code may be sent in response to any command requiring a change in or the negotiation of a security mechanism. It is considered a transient negative reply as the error is considered temporary. In this case, the client is encouraged to restart the FTP transaction and try again.
Example response
431 Need unavailable resource to process security.