Facing issue with ftp passive mode on

Issue

• Able to login ftp server but when passive mode is "ON" all command get hung.However in passive mode "OFF" then all ftp commands workings fine.
• Example when ftp use to get hung state

$ ftp xx.yy.zz.ww 21
Connected to xx.yy.zz.ww.
220 (vsFTPd 2.0.5)
530 Please login with USER and PASS.
KERBEROS_V4 rejected as an authentication type
Name (xx.yy.zz.ww:test): xxx
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> dir
[1]+  Stopped                 ftp xx.yy.zz.ww  (it was hung when issued dir command)

• Example with passive command

Connected to xx.yy.zz.ww.
220 (vsFTPd 2.0.5)
530 Please login with USER and PASS.
KERBEROS_V4 rejected as an authentication type
Name (xx.yy.zz.ww:test): XXXX
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> passive
Passive mode off.
ftp> mput yum.log.1
mput yum.log.1? y
200 PORT command successful. Consider using PASV.
150 Ok to send data.
226 File receive OK.
2588 bytes sent in 0.00014 seconds (1.8e+04 Kbytes/s)
ftp>