Allowing Multipart Transfers (COMB Command) on the Site

EFT Server supports multi-part transfers from advanced FTP clients such as CuteFTP Professional. The user must have appropriate privileges and be authorized to connect multiple times concurrently. The connecting client takes care of most details, including splitting the file apart, sending the multiple parts, and then requesting that the Server to join them again upon receipt. The COMB command joins the parts back together. The benefits of segmented (multi-part) and concurrent delivery for accelerated transfers include:

The COMB command is a proprietary command and is not defined nor endorsed by any FTP-related RFC; however, the command can be integrated with other servers using the following syntax:

COMB <TF> <SF 1> ... <SF n>


<TF> is the path to target file, which will contain the combined data from the source parts.

<SF #> are the source files (parts).

Which means combine n source files (SF 1...n) into one file (TF).

Notes regarding the COMB command:

Examples of using the COMB command:

The following table presents the support that is available for each protocol:


Upload to EFT Server

Download from EFT Server

EFT Server Push (offload/upload)

EFT Server Pull (retrieve/download)


Not supported

EFT Server does nothing to prevent a client from using whatever techniques it wants to perform a multi-part transfer. For example the client could use the REST command to resume multiple segments of the same file then rejoin upon receipt.

Not supported

Not supported


Not supported

Not supported

Not supported


Remote client must issue COMB command to EFT Server to join the uploaded parts.

Registry enabled (see below);

Remote server must support COMB command. Otherwise will not work.

Registry enabled (see below);

Does NOT require remote server to support COMB. Uses REST (resume) at byte offset.



Not supported

Not supported

Not supported


Not supported

Not supported

Not supported

Use the following Windows Registry settings to enable client offload/download multipart transfers over FTP/FTPS:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Globalscape\TED 6\Settings\Transfer]

"MultipartValue"=dword:00000004   [Number of parts (up to 8)]

"EnableMultipart"=dword:00000001  [Enable MP (0 (default)=disabled)]

To allow or block multipart transfers

  1. In the administration interface, connect to EFT Server and click the Server tab.

  2. In the left pane, click the Site that you want to configure.

  3. In the right pane, click the Connections tab.

  4. Click FTP/S Config. The FTP Settings dialog box appears.

  5. Do one of the following:

  6. Click OK to close the FTP Settings dialog box.

  7. Click Apply to save the changes on EFT Server.

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