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org.apache.commons.net.ftp.FTPConnectionClosedException: FTP response 421 received.  Server closed connection.	at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:388)	at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:300)	at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:523)	at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:648)	at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:622)	at org.apache.commons.net.ftp.FTP.quit(FTP.java:904)	at org.apache.commons.net.ftp.FTPClient.logout(FTPClient.java:1148)	at fr.alpagroupe.FTPUploadFileDemo.main(FTPUploadFileDemo.java:76)