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Connection closed without indication.
via Stack Overflow by Ricky Wen
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FTP response 421 received. Server closed connection.
org.apache.commons.net.ftp.FTPConnectionClosedException: Connection closed without indication. at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:316) at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:292) at org.apache.commons.net.ftp.FTP.getReply(FTP.java:712) at org.apache.commons.net.ftp.FTPClient.completePendingCommand(FTPClient.java:1857) at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3420) at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3335) at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:3012) at TestFTP.execute(TestFTP.java:27) at TestFTP.main(TestFTP.java:12)