Tente ativar o FTP passivo no seu cliente. Você pode ler mais sobre o ftp ativo / passivo aqui
In active mode FTP the client connects from a random unprivileged port (N > 1023) to the FTP server's command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client's specified data port from its local data port, which is port 20.
InpassivemodeFTPtheclientinitiatesbothconnectionstotheserver,solvingtheproblemoffirewallsfilteringtheincomingdataportconnectiontotheclientfromtheserver.