Updated April 6, 2017
This article explains why the 226 FTP reply code is sent.
All Serv-U versions
226 Closing data connection.
A 226 reply code is sent by the server before closing the data connection after successfully processing the previous client command affecting the data connection. In most cases, it signals the completion of a file transfer. It can also be sent in response to the ABOR command, which signals that the current file transfer was successfully terminated.