Topic "Partial or corrupted uploads detected?"

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Joined: 2005-02-26
Posts: 8
Location: Slovakia
What happens when WinSCP uploads a file but for some weird reason the file did not upload completely or correctly on the server. Will WinSCP detect that? In other words, is there a backward check that all files that have been uploaded are correctly uploaded? Or do you think this will never happen - if so, why?
Travel in All Senses
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Joined: 2002-12-10
Posts: 24759
Location: Prague, Czechia
Depends on reasons of failure and transfer protocol:
  • Dropped connection: The partially uploaded files remains in the target directory. With SFTP protocol, you can resume the transfer later.
  • Data are incorrectly transmitted: I believe that with SSH protocol this would by 99% cause confusion in the encryption and the connection closure by one side.
  • Data are incorrectly stored on the remote file system (but it was not detected by the server, i.e. strange HDD failure, i.e. not probable): This will not be detected. Only way to check this is to download the file back (nonsense) or use some hashing algorithm. As mentioned already today: Hashing is supported only by SFTP protocol and only as optional extension since version 5. And there is no SFTP server I'm aware of supporting protocol version 5.

Martin Prikryl

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