FTP could not connect to server

I've seen previous posts on this in forum and read the solutions, but none apply for me.

I attempt to connect using FileZilla, but it gives me error:

"Could not connect to server."

I'm not copying and pasting my user and pw - I'm carefully and manually typing them in each time.

(Note: in the past, I have successfully signed in numerous times and successfully uploaded clips.  But now it no longer works. So it used to connect, but now it does not).

I had a "Quickconnect" set up, where the host / user and pw was saved - and this quickconnect button worked in the past with the stored settings, but even that no longer works.  (This should remove any doubt that somehow I'm typing the user and pw incorrectly).

So did something change on Adobe Stock Server side?  

I repeat, it formerly worked and now it does not. I have been trying for weeks now - in case there was a temporary outage.  Still does not work.  Can anyone help?

thanks.