I am running vsftp pretty much 'out of the box', though I turned off IPv4 and have it listening on IPv6. I have stopped ip6tables, as the simple rule to enable port 21 is not allowing gftp to connect (pasv mode, I think). gftp to the IPv6 address, it connects and gets a directory listing. I am running gftp from my normal login userid, connecting to my normal login userid on the server. But when I try to download or upload a file, gftp just crashes. Nothing in /var/log on either system. Any advice?