First of all, what was written in the article How do I connect to an IPv6-only proServer (proServer2G)? regarding the SSH connection applies: if you have IPv6 connectivity at your workstation, nothing else is necessary - the connection works as usual.

If you only have a local uplink with IPv4, please read this entry first and make sure that you can successfully connect to the proServer via command line (Mac OS, BSD, Linux) or Putty (Windows).

The missing last step is then simple. First establish a command line connection as above (with Jumphost), but add port forwarding. The following additional parameters are used for this:

ssh -L 2222:127.0.0.1:22 vproWXYZ

Putty also has a dialog in which you can add port forwarding to a connection. Please leave the established command line session open.

Now start FileZilla, for example, and enter "localhost" as the server for the SFTP connection and "2222" as the port - the other parameters (user name, key file) as usual.