Situation: The client has FTP for clients to uploading or downloading files. Sometimes some users can’t access it.
Troubleshooting: 1. If the transfer settings is default, change it to Active.
2. If it uses only passive mode, make sure port 1024-65335 open on firewall.
3. If you open ports 1024-65535 for passive mode, make sure FTP server also use the same port rang. In syncplify.me, the default port range are 1-65335.
4. For security reason, you may want to create application for example FTP instead opening port rang.
