FTP Issue Generating error message (-41)

Dr. Perry / Leo greetings gentlemen and to whomever else is working on tech support.
I have been experiencing a strange issue with my DO Pro / FTP feature.
When I connect to my Windows Server 2016 via the FTP tool...

The error message says:

" An error occurred reading the folder:
bad message (-41) "

Here is a screenshot.

Let me know if you have any suggestion.

Thank you for the greatest File manager in the world.

Best place to start:

Hi Leo. Unfortunately, I need this connection on SFTP. The SFTP option is grayed-out when using SFTP. It's available however, on the other protocols.
So I am still stuck with this error message. I tried firewalls, off, etc. etc. to no avail.
Let me know if you concoct anything in your head.
Send my regards to Dr. Perry.
Thank you.

Is that a typo? Not sure what it means if not.

What does the FTP log say?