One of the new features in Syncovery version 6 is the ability to connect to an FTP server via an HTTP Proxy as well as SOCKS. This feature is somewhat hidden in the software, so here’s how to find it.
If you are using the FTP protocol, then on the Internet/FTP dialog, change the FTP library to 2. Then on the Proxy tab sheet, you will see the option to use an HTTP Proxy or to use SOCKS to connect.
If you are using SSH/SFTP, Web Tunneling and SOCKS is also supported via the Proxy tab sheet. In that case, use library 1 (SFTP).