FTP "null"


I have some issue to connect to FTP server

as you can see got this

Execute failed: (“FTPListParseException”): null

I can connect into the FTP from Mozzilla from the same IP address

HERE the log

2019-09-02 16:12:30,641 : WARN : SwingWorker-pool-5-thread-5 : : TestConnectionDialog$TestWorker : FTP Connection : 0:498 : Couldn’t connect
at it.sauronsoftware.ftp4j.FTPClient.list(FTPClient.java:2221)
at it.sauronsoftware.ftp4j.FTPClient.list(FTPClient.java:2273)
at org.knime.base.filehandling.remote.files.FTPRemoteFile.getFTPFile(FTPRemoteFile.java:430)
at org.knime.base.filehandling.remote.files.FTPRemoteFile.exists(FTPRemoteFile.java:201)
at org.knime.base.filehandling.remote.connectioninformation.node.TestConnectionDialog$TestWorker.doInBackgroundWithContext(TestConnectionDialog.java:238)
at org.knime.base.filehandling.remote.connectioninformation.node.TestConnectionDialog$TestWorker.doInBackgroundWithContext(TestConnectionDialog.java:1)
at org.knime.core.util.SwingWorkerWithContext.doInBackground(SwingWorkerWithContext.java:106)
at javax.swing.SwingWorker$1.call(SwingWorker.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at javax.swing.SwingWorker.run(SwingWorker.java:334)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Thanks !


Hello @geppopompo,

the FTPListParseException was thrown by an external library and it is hard to know exactly why it occurred. The exception was thrown because the library could not parse the response from the URL you provided, which could happen if it is not ftp that answers. e.g. you give the port of ssh instead of ftp.

Are you still experiencing this problem?

Best Regards,
Tobias U.

Hi Tobias,

yes i still have the issue!
The strange thing was also that connect worked for one time only, but right now is always give me that issue any Idea ?



Hi Gianpaola,

sorry for my late reply.

Can you connect the first time every time you start KNIME Analytics Platform or did it only work once and never again? I don’t have any good ideas why this is happening, but will ask around internally.

Best Regards,
Tobias U.

Hi Tobias ,

thanks for the support, I’m also cheeking internally if we have some “control” on user agent or any other limitation from the FTP site .


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