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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:367) at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294) at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:483) at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:608) at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:582) at org.apache.commons.net.ftp.FTP.noop(FTP.java:1763) at org.apache.commons.vfs2.provider.ftp.FTPClientWrapper.noop(FTPClientWrapper.java:488) at org.apache.commons.vfs2.provider.ftp.JBFtpKeepAliveCommand$1.invoke(JBFtpKeepAliveCommand.java:10) at com.jetbrains.plugins.webDeployment.connections.PatchedFtpFileSystem$2.run(PatchedFtpFileSystem.java:53) at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238) at com.intellij.util.Alarm$Request$1.run(Alarm.java:378) at com.intellij.util.Alarm$Request.run(Alarm.java:389) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at com.intellij.util.concurrency.SchedulingWrapper$MyScheduledFutureTask.run(SchedulingWrapper.java:227) at com.intellij.util.concurrency.BoundedTaskExecutor$2.run(BoundedTaskExecutor.java:187) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)