Login to your control panel
After your account has been created, or reactivated after a suspension, you may need to login to the hosting control panel once to enable FTP access to your account.
You can login to the control panel by logging in to the client area, go to the Accounts list and click Manage next to the account. Then, click the big green button which says Control Panel to login.
After this, you can try to reconnect to FTP.