WinSCP Access denied

Hi, I installed an Open BlackHole 4.4 image on a Vu + Zero 4K but with WinSCP 5.17.8 connecting with the correct ip and the right settings sends me the error: Access denied.
I state that with a previous BlackHole 3.1 image everything worked perfectly.
Any clarifications on this?
Thanks.

Do you believe this is WinSCP problem? Can you connect with any other FTP client?