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FXP stands for File eXchange Protocol, which uses the FTP protocol to transfer data from one remote server to another without routing this data through the client's connection. Conventional FTP involves a single server and a single client. A connection is established between the pair and all data transmission is limited to this connection. In an FXP session, a client maintains a standard FTP connection to two servers, and can direct either server to connect to the other to initiate a data transfer. The advantage of using FXP over FTP is evident when a high-bandwidth server demands resources from another high-bandwidth server, but only a low-bandwidth client, such as a network administrator working away from location, has the authority to access the resources on both servers.Enabling FXP support, however, can make a server vulnerable to a Denial of Service attack, known as FTP Bounce. FXP is also frequently used for warez trafficking. FTP server software often disable FXP by default.
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