[WSO2-ESB][FTP] java.io.IOException: Host attempting data connection 203.94.95.230 is not same as server 192.168.xx.xx

Issue

Following issue can occur when trying to connect to a ftp server through WSO2 ESB.

ERROR - FilePollingConsumer Error checking for existence and readability : ftp://wso2qa":***@"192.168.58.31/ESBJAVA-4493/in
org.apache.commons.vfs2.FileSystemException: Could not determine the type of file "ftp://wso2qa:***@192.168.48.231/ESBJAVA-4493/in".
 at org.apache.commons.vfs2.provider.AbstractFileObject.getType(AbstractFileObject.java:506)
 at org.apache.commons.vfs2.provider.AbstractFileObject.exists(AbstractFileObject.java:478)
 at org.wso2.carbon.inbound.endpoint.protocol.file.FilePollingConsumer.poll(FilePollingConsumer.java:172)
 at org.wso2.carbon.inbound.endpoint.protocol.file.FilePollingConsumer.execute(FilePollingConsumer.java:134)
 at org.wso2.carbon.inbound.endpoint.protocol.file.FileTask.taskExecute(FileTask.java:45)
 at org.wso2.carbon.inbound.endpoint.common.InboundTask.execute(InboundTask.java:44)
 at org.wso2.carbon.mediation.ntask.NTaskAdapter.execute(NTaskAdapter.java:90)
 at org.wso2.carbon.ntask.core.impl.TaskQuartzJobAdapter.execute(TaskQuartzJobAdapter.java:67)
 at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Host attempting data connection 203.94.95.230 is not same as server 192.168.xx.xx
 at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:912)
 at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:759)
 at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3293)
 at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3271)
 at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2930)
 at org.apache.commons.vfs2.provider.ftp.FTPClientWrapper.listFilesInDirectory(FTPClientWrapper.java:186)
 at org.apache.commons.vfs2.provider.ftp.FTPClientWrapper.listFiles(FTPClientWrapper.java:176)
 at org.apache.commons.vfs2.provider.ftp.FtpFileObject.doGetChildren(FtpFileObject.java:141)
 at org.apache.commons.vfs2.provider.ftp.FtpFileObject.getChildFile(FtpFileObject.java:111)
 at org.apache.commons.vfs2.provider.ftp.FtpFileObject.getInfo(FtpFileObject.java:200)
 at org.apache.commons.vfs2.provider.ftp.FtpFileObject.doGetType(FtpFileObject.java:335)
 at org.apache.commons.vfs2.provider.AbstractFileObject.getType(AbstractFileObject.java:497)
 ... 13 more

This error can occur when the server is trying to do a non passive connection to the FTP server.

Remedy

This issue can be avoided by making a passive connection to the ESB. You can modify the connection URL in the below format to achieve this.

ftp://wso2qa:wso2qa123@192.168.58.31/ESBJAVA-4493/in?vfs.passive=true