Auto Resume Overview

When a file transfer fails to complete, the auto resume feature lets you resume the incomplete file transfer operation. The auto resume feature works only under these circumstances:

• FTP server must support the REST command

  To auto resume a file transfer, the FTP Client sends a REST command (restart) to the server. If the server does not support the REST command, the file transfer will start from the beginning of the file. For each site, after the first auto resume operation is attempted, the FTP Client will remember if the server supports the REST command. If the server does not support the REST command, the Client won't attempt to perform an auto resume for any file transferred from that server.

• FTP Client must use the binary file transfer method

  The auto resume feature only works for files that are transferred using the binary file transfer method. Auto resume compares the size of the source file to the size of the incomplete target file to determine at what point in the source file it should resume the transfer. You must use the binary method to ensure that the file created on the local machine matches the size of the source file. An ASCII file transfer creates a file on the local machine that may differ in size from the source file.

• File transfer mode cannot be Append

  Auto resume compares the size of the source file to the size of the incomplete target file to determine at what point in the source file it should resume the transfer. When you transfer a file using the Append mode, the FTP Client can't use the existing target file size to determine the restarting point to use in the source file.