Technical
Although FXP is often considered a distinct protocol, it is in fact merely an extension of the FTP protocol and is specified in RFC 959:
User-PI - Server A (Dest) User-PI - Server B (Source) ------------------ ------------------ C->A : Connect C->B : Connect C->A : PASV A->C : 227 Entering Passive Mode. A1,A2,A3,A4,a1,a2 C->B : PORT A1,A2,A3,A4,a1,a2 B->C : 200 Okay C->A : STOR C->B : RETR B->A : Connect to HOST-A, PORT-aRead more about this topic: File EXchange Protocol
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