vsftpd for ipv6 still not working on ubuntu

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http://www.linuxquestions.org – hi all, i want vsftpd for ipv6 . my address is 2001:e30:1c05::a72:c0c and i install ftp by "apt-get install vsftpd" and made these changes in /etc/vsftpd.conf: commented this line: listen=yes uncommented this line: listen_ipv6=yes after this restarted ftp but still not working and print this on command: ftp 2001:e30:1c05::a72:c0c ftp:2001:e30:1c05::a72:c0c:Unknown host plz help me now how to fix? (HowTos)