FTP Connector "IOException: 501 Character (-) not allowed in object name"

Hi everyone, I am trying to see the folders and files that are inside a FTP but I get this error message IOException: 501 Character (-) not allowed in object name, after clicking “Browse” in the Working Directory option

I guess that is related to my company’s FTP as I managed to see the folders using another FTP ftp.ncbi.nih.gov

The IT person told me that this is the path after the GET request

get FOLDER1/FOLDER2 D:/temp/folder3/folder4/folder5/file.CSV

So I suspect that I should type something specific in the Working Directory, but I have tried many path unsuccessfully.

Thank you

Hi @salazachou

I’m afraid standardization across FTP servers isn’t as far as one would expect, given the age of this protocol.

Could you maybe investigate what exact FTP server (version) is running?
Given the path, I assume it’s running on a Windows server?

What version of KNIME are you using? If you’re not yet on version 4.4.x, the new version may already fix that issue for you.

Kind regards


Hi Marvin thank you for your response, by moment the current Knime version is 4.4.2 and I will ask for the other questions.,


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Hi @salazachou,

depending on your server (on Windows), you may also be able to use the SMB Connector – KNIME Hub to connect to it.

Kind regards


Hi Marvin thank you, I will check that out as well.

Best Regards

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