421 Service not available, remote server has closed connection?

I have filled the benchmark table for vsftpd_v1 .But when I start iftp for vsftpd_v2 then it shows 421 Service not available, remote server has closed connection? . I have checked that my 8081 port is in listen mode and I have made no change to log file till now.This error is shown when I try for get command.

You can check for the references of that error in forum and also remember that few of the vsftpd versions are faulty.