I checked your account, everything seems to be fine. You are using our free FTP hosting service. The free service is designed for personal and casual use only, e.g. a user may use FileZilla or Ws-FTP to upload/download some image / video files. It is not designed for automatic FTP scripts or devices. This being said, your usage is low. I don't think our FTP server has blocked your device as of now. Please test it with FileZilla first and check if you can upload/download files using FileZilla. If not, please email us the detailed FTP log.
More trouble-shooting is available for paid business customers. If you can email us the detailed info about how you configured your device, our engineers can check more for you.