Editing File eXchange Protocol (section)

==FXP over SSL==
Some [[FTP Server]]s such as [[glFTPd]], cuftpd, RaidenFTPD, drftpd, and wzdftpd support negotiation of a secure data channel between two servers using either of the FTP protocol extension commands; CPSV or SSCN. This normally works by the client issuing CPSV in lieu of the PASV command—or by sending SSCN prior to PASV transfers—which instructs the server to create either a [[Secure Sockets Layer|SSL]] or [[Transport Layer Security|TLS]] connection. However, both methods—CPSV and SSCN—may be susceptible to [[man-in-the-middle attack]]s, if the two FTP servers do not verify each other's SSL certificates. SSCN was first introduced by RaidenFTPD and [[SmartFTP]] in 2003 and has been widely{{Citation needed|date=July 2010}} adopted.{{When|date=July 2010}}