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Michael Reichenbach commented on FTPSERVER-435: ----------------------------------------------- I know this ticket is old, but is there any progress on this? I'm maybe facing the same problem... using apache commens net 3.4 > FTPClient - 3.0.1 - Randomly throwing connection timed out error during > listfile / connect > ------------------------------------------------------------------------------------------ > > Key: FTPSERVER-435 > URL: https://issues.apache.org/jira/browse/FTPSERVER-435 > Project: FtpServer > Issue Type: Bug > Reporter: vijayan > Priority: Critical > > Previously we were using common-net-2.2 version and at sometimes we used to > get FTPconnectionclosedexception. This was resolved by upgrading to > commons-net-3.0.1 version using control keep-alive timeout feature. Now we > are facing another issue in a random time interval in our production > environment. Most of the times it works fine but at time during > ftpclient.listfiles /ftpclient.connect call we are getting the connection > timed out exception. Please see the exception stacktrace. > java.net.ConnectException: Connection timed out > at java.net.PlainSocketImpl.socketConnect(Native Method) > at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351) > at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213) > at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200) > at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) > at java.net.Socket.connect(Socket.java:529) > at > org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:726) > at > org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2990) > at > org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2965) > at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2685) > ================================================================ > java.net.ConnectException: Connection timed out > at java.net.PlainSocketImpl.socketConnect(Native Method) > at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351) > at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213) > at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200) > at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) > at java.net.Socket.connect(Socket.java:529) > at org.apache.commons.net.SocketClient.connect(SocketClient.java:168) > at org.apache.commons.net.SocketClient.connect(SocketClient.java:189) > Neven seen / faced this kind of exception when using 2.2 version. This is > been occurring after the upgradation. -- This message was sent by Atlassian JIRA (v6.3.4#6332)