There's probably not much we can help you with here. Start by contacting your webhosting provider support. You might have been banned here.
I have been using an old version of WinSCP successfully for several years to upload a webcam picture to a website. The uploads run on a remote Windows 10 computer, and it stopped uploading a few days ago. I've installed WinSCP v6.1.2, but trying to connect from the webcam computer fails with a "Connection timed out" message.
I CAN connect to the site using my local Windows 10 computer using v6.1.2 with no trouble. I have also tried FileZilla on both computers, and get the same results – my local unit connects, the remote unit times out. It appears as if the site I am connecting to is rejecting the connection from my remote computer.
Any ideas where to start looking for the problem?