What is FXP (Site to Site) transfer?

FXP stands for File eXchange Protocol. It lets you copy files from one FTP-server to another using an FXP-client without going through your local machine. There are two precondition for the FXP operation:

• Both server must support the FXP and have it enabled. Many servers do not enable it due by default to potential security risk.
• One server should support PASV mode and the other server must allow PORT commands from a foreign address.

The following is a diagram showing the example of an FXP transfer.

                   Control     ------------   Control
                    ---------->| User-FTP |<-----------
                    |          | User-PI  |           |
                    |          |   "C"    |           |
                    V          ------------           V
            --------------                        --------------
            | Server-FTP |   Data Connection      | Server-FTP |
            |    "A"     |<---------------------->|    "B"     |
            -------------- Port (A)      Port (B) --------------

   

                        Figure 1. FXP example

You can FXP files using CrossFTP by opening a remote server tab in the left and right side. (To create a new remote tab, choose File -> New Tab) Then you can drag and drop between these two remote tabs to make the FXP transfers. Here is a Flash tutorial for the FXP operation in CrossFTP for your reference. You can view more CrossFTP tutorials from our Tutorial page.