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From a user: Psftp doesn't check return value for SSH2_FXP_CLOSE request. The specifictaions of sftp protocol state: "The response to this request will be a SSH_FXP_STATUS message. One should note that on some server platforms even a close can fail. This can happen e.g. if the server operating system caches writes, and an error occurs while flushing cached writes during the close." http://www.openssh.org/txt/draft-ietf-secsh-filexfer-02.txt The server we use will identify failure when closing the file. Currently psftp doesn't give any indication of the failure. Psftp should check the return value and if close is not succesfull after writing to a file, user should be informed about failed file transfer operation. psftp -h PuTTY Secure File Transfer (SFTP) client Release 0.60 The problem happens at least on Windows, but I would assume that it affects all platforms. Unfortunately the only server I know that has this problem is not shared in public (only sold to certain group of organizations), so mentioning it wouldn't help as you wouldn't be able to test it anyway. But the problem should be quite trivial to fix without testing. The server in question doesn't overwrite old file if such exists with the same name, if closing fails. So please don't try to use stat() or similar to find out if the transfer was successful, even if close fails. If close fails, file is not transfered.
Audit trail for this bug.