Change your account password
Sometimes, the hosting account password is not properly synchronized across all services. To fix this, you can change the password of your hosting account, which should force the new password to be set correctly everywhere.
To change your hosting account password, login to the client area, go to the Accounts list and click Manage next to the account. Then, click the Edit Account button and scroll down to the Hosting Account Password panel, and update your password there.
After setting the new password, login to the control panel once to ensure FTP access is enabled. After that, you can attempt to reconnect to FTP with the new password.