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Home > Success Center > Serv-U Managed File Transfer & Serv-U FTP Server > 535 FTP response code

535 FTP response code

Updated May 3, 2017


This article provides information on 535 FTP response code.


All Serv-U versions


A 535 response code may be sent in response to any command involving file transfer if any data protection services fail at any time at the server end (including an attempt to send a buffer size greater than the negotiated amount).

Example response

535 Failed security check.

Possible commands



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