Help Needed! SFTP Connection Error "An FTP error occured"

Hi. Sorry to bug everyone. But I was trying to edit and update my site as I usually do. The connection to remote server broke and I was unable to reconnect since then. I'm using SFTP connection and the exact workflow has been working smoothly for a few years since I initally built the site. Please refer to the screenshot for the error message. I don't know much about this subject, and I basically built the website with the help of a few youtube videos. So bascially I have no clue at all what's wrong there. I did a preliminary research in the past few days and didn't come to a solution yet. It would be much appreciated if anyone can inspire me a little bit. Thanks guys.

P.S. I'm confident that my login credentials (password and username) for the hosting service I subscribed is typed in correctly. And FYI, my site is: http://www.jiiiiii.com