This is a global issue. I would recommend you to wait patiently for a few hours as there was some technical issue in iFastnet as stated by the Admin. The problem is solved but it will take time to re-sync the database.
I’m sorry, but I think I know quite well how our platform works. And I think the status of any domain name does not affect the status of the account hosting that domain name.
If you believe the domain issue is the cause, feel free to wait until that issue is fixed and get access to FTP. But if the domain comes back online and your FTP doesn’t, then just explain the issue so I can help you.