I am using the current FTP Connector node, and while the connection works, I am not able to select any folders in the List Files/Folders node.
I noticed in another post that someone ended up using the legacy nodes, and doing that worked for me:
Hi @npatrick -
What version of KNIME and OS are you using? Are you by chance on a VPN, and does the behavior change depending on whether you are using a VPN or not?
Just looking for a bit of additional detail before I refer this to a developer or QA tester on our end. 
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Hi @ScottF ,
My apologies for the delayed response.
I am using Knime 4.7.8 on Windows.
I tried it at work (not on a VPN, but I have run into security issues in the past),
and at home (which is also not on VPN).
In both cases the behavior is the same:
FTP Connector:
When looking at the List Files/Folders node:
FTP Connector (Legacy):
When looking at the List Remote Files (Legacy) node:
I have worked around it, but it’s odd that it seems to only affect me.