The server was attempting to send data to the client over the data connection, but an error occurred executing the send() socket function for the data connection. The data transfer is ended.
Control is returned to the client connection for further command processing.
The command can be tried again. If the problem persists, contact the system programmer
If necessary, re-create the problem with FTP server traces active. The send() error will create a trace record with the send() return code. Determine the cause of the send error and correct the problem.