FTP server on ipv6 IP address

I followed the instructions, and I just cannot resolve my problem.
I also tried to setting things up via the DW-export method. But I always got the following output.

What am I doing wrong? Or, where can I find more detailed explenation of how to set up the ftp connection?

Testing Connection …

• set color:use-color yes
• set cmd:interactive yes
• set file:charset utf-8
• set xfer:clobber on
• set ftp:timezone
• set cmd:show-status yes
• set cmd:set-term-status yes
• set ftp:list-options -a
• set cmd:fail-exit yes
• set cmd:time-style “%Y-%m-%d %H:%M:%S”
• set ftp:ssl-allow no
• set ssl:verify-certificate no
• set net:max-retries 3
• set net:timeout 20
• set net:reconnect-interval-base 5
• set net:reconnect-interval-multiplier 1
• open -u “user,pass” ftp://mysite.com
  ---- Resolving host address…
  ---- 2 addresses found: 2a01:7860::db:1152:10:1, xxx.xxx.xxx.xxx
• cd public_html/
  ---- Connecting to mysite.com (2a01:7860::db:1152:10:1) port 21
  **** Timeout - reconnecting
  ---- Closing control socket
  ---- Connecting to mysite.com (2a01:7860::db:1152:10:1) port 21
  **** Timeout - reconnecting
  ---- Closing control socket
  ---- Connecting to mysite.com (2a01:7860::db:1152:10:1) port 21
  **** Timeout - reconnecting
  ---- Closing control socket
  cd: Fatal error: max-retries exceeded